Synthesis of Aliphatic Polyester by Insertion of Glycols into Polyanhydrides Using Lipase Catalyst
作者:Hiroshi Uyama、Satoshi Wada、Shiro Kobayashi
DOI:10.1246/cl.1999.893
日期:1999.9
Polyester synthesis was carried out by insertion-dehydration of glycols into polyanhydrides using Candida antarctica lipase as catalyst. The insertion of 1,8-octanediol into poly(azelaic anhydride) took place under mild reaction conditions to give the corresponding polyester with molecular weight of several thousands.
oxa-conjugate addition has been employed in a stereoselective synthesis of enantiopure polyalkyl-substituted tetrahydropyrans, which are frequently found as substructures in many natural products. The requisite cyclization precursors, 7-hydroxy-2-enimides 3 and 7-hydroxy-2-enoates 6 were easily accessible by silyloxyCoperearrangements of the appropriate chiral syn-aldols. It was found that the stereoselectivity