Isomannide and isosorbide as new chiral auxiliaries for the stereoselective synthesis of tertiary α-hydroxy acids
作者:André Loupy、Daphné A Monteux
DOI:10.1016/s0040-4020(02)00024-8
日期:2002.2
isosorbide are selectively protected to provide new chiral auxiliaries suitable for the preparation of enantiopure tertiary α-hydroxy acids. Diastereoselective additions of organozinc reagents on the derived phenylglyoxylates afford the desired α-hydroxy acids with 60–99% ee after saponification. Both absolute configurations of the α-hydroxy acids can be accessed, by adapted choice of either the starting
异甘露糖醇和异山梨醇被选择性保护,以提供适用于制备对映纯叔α-羟基酸的新型手性助剂。在衍生的苯乙醛酸酯上非对映选择性地添加有机锌试剂,可在皂化后提供具有60-99%ee的所需α-羟基酸。的α羟基酸既绝对构型可以通过起始二醇或保护基团的选择适于进行访问。