<unk>  is a strategy that aims to improve the efficiency of<unk>  synthesis. It  starts the organic synthesis of a complex enantiopure chemical compound from a stock of readily available enantiopure substances. Common<unk>  starting materials include monosaccharides and amino acids. The built-in<unk> ity is then preserved in the remainder of the reaction sequence.
This strategy is especially helpful if the desired molecule bears a great resemblance to cheap enantiopure natural products. Otherwise, a long, tortuous synthesis involving many steps with attendant losses in yield may be required. At times, it may be difficult to find a suitable enantiopure starting material; other techniques may prove more fruitful.
General methods used in<unk>  are the use of protecting groups, and functional group interconversion (FGI).
Chiral pool synthesis
Pyruvate decarboxylation
Fatty acid metabolism
Arndt-Eistert synthesis
Beta oxidation
Lipogenesis
Cellular respiration
Oxidative phosphorylation