作者:Bang-Chi Chen、Michael C. Weismiller、Franklin A. Davis、Diane Boschelli、James R. Empfield、Amos B. Smith
DOI:10.1016/s0040-4020(01)80914-5
日期:1991.1
An asymmetric synthesis of the highly oxygenated cyclopentanoid antibiotic (+)-kjellmanianone (1) has been achieved. The key step entailed enantioselective hydroxylation of the prochiral sodium enolate of β-keto ester 2 with the new, enantiomerically pure N-sulfonyloxaziridine 7b, affording 1 in 68.5% ee (60% yield). Possible transition state structures for the asymmetric oxidation are evaluated.
已经实现了高度氧化的环戊烷类抗生素(+)-kjellmanianone(1)的不对称合成。关键步骤是用新的对映体纯的N-磺酰基氧氮丙啶7b将β-酮酸酯2的前手性烯醇钠的对映体选择性羟基化,得到1的68.5%ee(收率60%)。对不对称氧化的可能过渡态结构进行了评估。