Concise, efficient and highly selective asymmetric synthesis of (+)-(3S,4R)-cisapride
作者:Stephen G. Davies、Rosemary Huckvale、Thomas J.A. Lorkin、Paul M. Roberts、James E. Thomson
DOI:10.1016/j.tetasy.2011.08.020
日期:2011.7
A concise asymmetric synthesis of the gastroprokinetic agent (+)-(3S,4R)-cisapride (+)-(3S,4R)-N(1)-[3′-(4″-fluorophenoxy)propyl]-3-methoxy-4-(2″′-methoxy-4″′-amino-5″′-chlorobenzamido)piperidine} from commercially available starting materials has been developed. The key step of this synthesis employs the diastereoselective conjugate addition of lithium (R)-N-benzyl-N-(α-methylbenzyl)amide to tert-butyl
胃动能剂(+)-(3 S,4 R)-西沙必利(+)-(3 S,4 R)-N(1)-[3'-(4''-氟苯氧基)丙基的简明不对称合成已经开发了来自可商购的起始原料的] -3-甲氧基-4-(2″′-甲氧基-4″′-氨基-5″′-氯苯甲酰胺基)哌啶}。该合成的关键步骤是将锂(R)-N-苄基-N-(α-甲基苄基)酰胺非对映选择性共轭加成至叔丁基5- [ N -3'-(4″-氟苯氧基)丙基-N -烯丙基氨基]戊-2-烯酸酯和用(-)-樟脑磺酰基恶唑烷原位烯酸酯氧化以设定(3 S在产物的哌啶环中发现了,4 R)-构型。该合成从市售的1-(4'-氟苯氧基)-3-溴丙烷分9步进行,总产率为19%。