Synthesis of diastereoisomerically pure 5-substituted 5-(l-menthyloxy)-4-(pyrrolidin-1-yl)furan-(5H)-ones
作者:M. Rosario Martín、Ana I. Mateo
DOI:10.1016/0957-4166(95)00207-6
日期:1995.7
Reactions of lithium enolate 2, generated from (5S)-5-(l-menthyloxy)-4-(pyrrolidin-1-yl)furan-2(5H)-one (1a) or from the mixture of epimers at C-5 (1a, 1b), with different sort of electrophiles, such as alkylating agents, aldehydes, acyl chlorides, dimethyl carbonate and a Michael acceptor, occur regioselectively and stereoselectively from the Re face of the enolate to give the corresponding 5-substituted
由(5 S)-5-(1-薄荷氧基)-4-(吡咯烷-1-基)呋喃-2(5 H)-one(1a)或由差向异构体混合物在C生成的烯醇酸锂2的反应-5(1a,1b),具有不同种类的亲电试剂,例如烷基化剂,醛,酰氯,碳酸二甲酯和迈克尔受体,从烯醇化物的Re区域区域性和立体选择性地出现,得到相应的5取代的衍生物综合有用的产量。反应的立体选择性受亲电试剂反应中心上取代基的性质和空间体积的影响。