First enantioselective synthesis of (+)-(3R,3aS,6aS)-3-hydroxy-3,3a,4,6a-tetrahydrocyclopenta[b]furan-2-one — a versatile chiral heterocyclic building block
作者:Steffen Kudis、Günter Helmchen
DOI:10.1016/s0040-4020(98)00497-9
日期:1998.8
phosphinooxazoline 2 as chiral ligand enantiomeric excess of > 99% and > 90% yield were obtained. Alkylation products were transformed in three steps to (+)-(3R,3aS,6aS)-3-hydroxy-3,3a,4,6a-tetrahydrocyclopenta[b]furan-2-one (1a) in up to 52 % yield.
描述了2-乙酰氧基丙二酸酯与2-环戊烯基氯的不对称Pd催化的烯丙基烷基化。使用基于环丙三烯的膦酰基恶唑啉2作为手性配体,对映体过量> 99%,> 90%。将烷基化产物分三步转化为(+)-(3R,3aS,6aS)-3-羟基-3,3a,4,6a-四氢环戊[b]呋喃-2-酮(1a),收率高达52% 。