next , embodiments are combined to further clarify the invention , wherein , the technicians of the major can adjust for implementation according to specific circumstances or relevant knowledge as for technical solutions which are not described in details in the invention or are similar with the method in the field . iron powder ( 0 . 670 g , 12 mmol ) was added into etoh / h2o ( v / v = 6 : 1 , 100 ml ) solution of 2 , 4 - dinitrophenyl glycidyl ether ( 0 . 480 g , 2 mmol ) and acetic acid ( 1 ml , 17 . 5 mmol ) at reflux temperature . the reaction mixture was refluxed continuously for 120 minutes , and cooled to room temperature , saturated na2co3 solution was used for adjusting ph = 8 , the solution was leached out with c salt for concentrating ethanol and water in the filtrate , and the solid ethanol was obtained ( 10 ml × 4 ). ethanol phase was dried with anhydrous mgso4 and filtered to obtain crude products ; the above crude products were separated with silica gel column chromatography ( ethanol as developing agent ), and 2 , 3 - dihydro - 3 - hydroxymethyl - 6 - amino -[ 1 , 4 ]- benzoxazine ( 0 . 149 g , 42 %) was prepared . the embodiment 2 relates to detection of influence of 2 , 3 - dihydro - 3 - hydroxymethyl - 6 - amino -[ 1 , 4 ]- benzoxazine on forms of embryonic stem cells ; the embryonic stem cells were evenly grown in a 24 - well plate according to density of 2 × 104 cells / well , dmem ( high glucose ) containing leukemia inhibitory factor , l - glutamine , streptomycin , β - mercaptoethanol , non - essential amino acids , nucleotides and 15 % pbs was used for culturing for 24 hours , the waste liquid was discarded after the cells adhered on the wall , and the cells were cleaned with 1 × pbs . a normal group was set : the normal group was cultured under the culture condition that leukemia inhibitory factor was removed ; solvent control group : the group was cultured after dmso was added under the culture condition that leukemia inhibitory factor was removed ; experimental group : the group was cultured after 2 , 3 - dihydro - 3 - hydroxymethyl - 6 - amino -[ 1 , 4 ]- benzoxazine with the concentration of 0 . 5 μm , 1 μm , 5 μm , 10 μm , 20 μm , 30 μm and 40 μm was added under the culture condition that leukemia inhibitory factor was removed . the culture conditions : 37 ° c ., co2 incubator box for cultivation . the culture medium should be replaced everyday in a timing mode , and the cells were continuously cultured for ten days and then were observed under an inverted phase contrast microscope . the results showed that : compared with the normal group and the solvent control group , the 1 ˜ 20 μm treatment group in the experimental group was changed compared with the cell form of the control group , and the 2 , 3 - dihydro - 3 - hydroxymethyl - 6 - amino -[ 1 , 4 ]- benzoxazine with the concentration of 10 μm can prominently prompt the embryonic stem cells to show the vascular endothelial form . the embryonic stem cells were evenly grown in a 48 - well plate and cultured for 24 hours with dmem ( high glucose ) containing leukemia inhibitory factor , l - glutamine , streptomycin , β - mercaptoethanol , non - essential amino acids , nucleotides and 15 % fbs , the waste liquid was discarded after the cells adhered on the wall , and the cells were cleaned with 1 × pbs . the normal group was set : the group was cultured under the culture condition that leukemia inhibitory factor was removed ; solvent control group : the group was cultured after dmso was added under the culture condition that leukemia inhibitory factor was removed ; experimental group : the group was cultured after 2 , 3 - dihydro - 3 - hydroxymethyl - 6 - amino -[ 1 , 4 ]- benzoxazine with the concentration of 0 . 5 μm , 1 μm , 5 μm , 10 μm , 20 μm , 30 μm and 40 μm was added under the culture condition that leukemia inhibitory factor was removed . the culture conditions : 37 ° c ., co2 incubator box for cultivation . the culture medium should be replaced everyday , the waste liquid is discarded 10 days later , the cells were fixed with 4 % paraformal - dehyde for 15 minutes after being washed for three times with 0 . 1 × pbs , lowlenthal serum was sealed for 20 minutes after cleaning , the primary antibody of flk - 1 was added for incubation overnight at 4 ° c ., 0 . 1 × pbs was used for washing for three times , the second antibody was added for incubation at 37 ° c . for 40 minutes , the expression of endothelial cell marker — flk - 1 was observed with laser scanning confocal microscopy after cleaning . the results showed that : the flk - 1 expression in 23 - dihydro - 3 - hydroxymethyl - 6 - amino -[ 1 , 4 ]- benzoxazine with the concentration of 1 μm ˜ 20 μm experiment groups was increased , the cells processed with 10 μm 23 - dihydro - 3 - hydroxymethyl - 6 - amino -[ 1 , 4 ]- benzoxazine had stronger flk - 1 expression compared with the normal group , the solvent control group and other groups of the experimental group . it is indicated that 10 μm 2 , 3 - dihydro - 3 - hydroxymethyl - 6 - amino -[ 1 , 4 ]- benzoxazine can significantly induce embryonic stem cells to differentiate to vascular endothelial cells ( see fig2 ). the embryonic stem cells were evenly grown in a 6 - well plate according to the density of 2 × 104 cells / well , and cultured for 24 hours with dmem ( high glucose ) containing leukemia inhibitory factor , l - glutamine , streptomycin , β - mercaptoethanol , non - essential amino acids , nucleotides and 15 % fbs , the waste liquid was discarded after the cells adhered on the wall , and the cells were cleaned with 1 × pbs . the normal group was set : the group was cultured under the culture condition that leukemia inhibitory factor was removed ; solvent control group : the group was cultured after dmso was added under the culture condition that leukemia inhibitory factor was removed ; experimental group : the group was cultured after 2 , 3 - dihydro - 3 - hydroxymethyl - 6 - amino -[ 1 , 4 ]- benzoxazine with the concentration of 0 . 5 μm , 1 μm , 5 μm , 10 μm , 20 μm , 30 μm and 40 μm was added under the culture condition that leukemia inhibitory factor was removed . the culture conditions : 37 ° c ., co2 incubator box for cultivation . the culture medium should be replaced everyday , and the cells should be continuously cultured for ten days . the total protein of each group of cells was distilled with cell lysate . the protein samples were denatured for 5 min at 100 ° c ., glue was removed then , the protein was transferred on the pvdf film after completion , the pbs / t solution containing 5 % skimmed milk powder was used for sealing for one hour at room temperature . the pbs / t solution containing 3 % bovine serum almbumin was used for diluting the primary anti - body ( 1 : 5000 ), and incubated overnight with the pvdf film containing target protein at 4 ° c . pbs / t was used for dipping the film twice 5 min each time . pbs was used for diluting the secondary antibody ( 1 : 5000 ) and the cells were incubated for one hour at room temperature , the film was dipped with psb for three times and 5 min each time . ecl chromogenic reagent was evenly coated on the pvdf film containing target protein ad reacted for five minutes , excessive chromogenic reagent was removed , and the cells were placed together with the film in a dark box for five minutes to finish film colour development . the results showed that : the cd31 expression in 23 - dihydro - 3 - hydroxymethyl - 6 - amino -[ 1 , 4 ]- benzoxazine with the concentration of 1 μm ˜ 20 μm experiment groups was increased , the cells processed with 10 μm 23 - dihydro - 3 - hydroxymethyl - 6 - amino -[ 1 , 4 ]- benzoxazine had stronger cd31 expression compared with the solvent control group and other groups of the experimental group . it is indicated that 10 μm 2 , 3 - dihydro - 3 - hydroxymethyl - 6 - amino -[ 1 , 4 ]- benzoxazine can significantly induce embryonic stem cells to differentiate to vascular endothelial cells ( see fig3 ). the embryonic stem cells were evenly grown in a 24 - well plate according to the density of 2 × 104 cells / well and cultured for 24 hours with dmem ( high glucose ) containing leukemia inhibitory factor , l - glutamine , streptomycin , β - mercaptoethanol , non - essential amino acids , nucleotides and 15 % fbs , the waste liquid was discarded after the cells adhered on the wall , and the cells were cleaned with 1 × pbs . the normal group was set : the group was cultured under the culture condition that leukemia inhibitory factor was removed ; solvent control group : the group was cultured after dmso was added under the culture condition that leukemia inhibitory factor was removed ; experimental group : the group was cultured after 2 , 3 - dihydro - 3 - hydroxymethyl - 6 - amino -[ 1 , 4 ]- benzoxazine with the concentration of 0 . 5 μm , 1 μm , 5 μm , 10 μm , 20 μm , 30 μm and 40 μm was added under the culture condition that leukemia inhibitory factor was removed . the culture conditions : 37 ° c ., co2 incubator box for cultivation . the culture medium should be replaced everyday , the cells were continuously cultured for ten days , then , the cells were placed in the 24 - well cell culture plate paved with matrigel and placed at 37 ° c ., the cells were incubated in the co2 culture box for 60 minutes . the cells of each group were suspended in the dmem ( high glucose ) culture medium containing no factor according to the density of 4 - 5 × 104 cells / well , and inoculated in the 24 - well cell culture plate paved with matrigel . the cell culture plate was placed at 37 ° c . in a co2 culture box for culturing for 4 to 96 hours . the vascularization conditions of the blood vessel endothelial cells on the matrigel were observed under an inverted phase contract microscope respectively on the 6th hour , 12th hour , 24th hour and 48th hour . the results showed that : in the detection of in vitro vascularization , the cells of the experimental group of 2 , 3 - dihydro - 3 - hydroxymethyl - 6 - amino -[ 1 , 4 ]- benzoxazine with the concentration of 1 - 20 μm can form varying degrees of cavity - like vessel - like structures on matrigel , wherein , the embryonic stem cells induced with 2 , 3 - dihydro - 3 - hydroxymethyl - 6 - amino -[ 1 , 4 ]- benzoxazine with the concentration of 10 μm can prominently form blood vessels on matrigel 10 μm treatment group ( see fig4 ). the embryonic stem cells were evenly grown in a 24 - well plate according to the density of 2 × 104 cells / well and cultured for 24 hours with dmem ( high glucose ) containing leukemia inhibitory factor , l - glutamine , streptomycin , β - mercaptoethanol , non - essential amino acids , nucleotides and 15 % fbs , the waste liquid was discarded after the cells adhered on the wall , and the cells were cleaned with 1 × pbs . the normal group was set : the group was cultured under the culture condition that leukemia inhibitory factor was removed ; solvent control group : the group was cultured after dmso was added under the culture condition that leukemia inhibitory factor was removed ; experimental group : the group was cultured after 2 , 3 - dihydro - 3 - hydroxymethyl - 6 - amino -[ 1 , 4 ]- benzoxazine with the concentration of 0 . 5 μm , 1 μm , 5 μm , 10 μm , 20 μm , 30 μm and 40 μm was added under the culture condition that leukemia inhibitory factor was removed . the culture conditions : 37 ° c ., co2 incubator box for cultivation . the culture medium should be replaced everyday , the cells were continuously cultured for ten days , the dil - ac - ldl was diluted into 10 μl / ml with fresh differential culture medium and added into the cell culture plate , it is incubated for six hours at 37 ° c . in the co2 culture box . the conditions of phagocytosing dil - ac - ldl were detected with laser confocal microscopy . the results showed that : in the detection of function of phagocytosing dil - ac - ldl , the cells processed with 2 , 3 - dihydro - 3 - hydroxymethyl - 6 - amino -[ 1 , 4 ]- benzoxazine with the concentration of 1 - 20 μm can phagocytose dil - ac - ldl the embryonic stem cells induced with 2 , 3 - dihydro - 3 - hydroxymethyl - 6 - amino -[ 1 , 4 ]- benzoxazine with the concentration of 10 μm can prominently phagocytose dil - ac - ldl ( see fig5 ).
an application of 2 , 3 - dihydro - 3 - hydroxymethyl - 6 - amino -- benzoxazine in the preparation of drugs inducing embryonic stem cells to differentiate to vascular endothelial cells , wherein the concentration of the 2 , 3 - dihydro - 3 - hydroxymethyl - 6 - amino -- benzoxazine in the preparation of drugs effectively inducing mouse embryonic stem cells to differentiate to vascular endothelial cells is 1 ˜ 20 μm . the 2 , 3 - dihydro - 3 - hydroxymethyl - 6 - amino -- benzoxazine provided by the invention lays foundation for preparing and developing drugs inducing embryonic stem cells to differentiate to vascular endothelial cells , can be used as an effective research tool of embryonic stem cells , and can be used for researching on embryonic stem cell differentiation and new molecular mechanisms of blood vessel formation .