Asymmetric Electrophilic α-Amidoalkylation, VII1): Generation, Crystal Structure, and Trapping Reactions of a Chiral 6,7-Dimethoxy-1,2,3,4-tetrahydroisoquinoline Derived N-Acyliminium Ion
作者:Klaus Th. Wanner、Ilona Praschak、Ulrich Nagel
DOI:10.1002/ardp.19903230605
日期:——
The camphanic acid amide 4 has efficiently been oxidized with triphenylcarbenium tetrafluoroborate (3) to yield the chiral N‐acyliminium ion 1. Trapping reactions of 1 with the silyl nucleophiles 7a‐c and 10a‐f proceeded with stereoselective bond formation, affording the diastereomers (R)‐8/(S)‐9a‐c and (R)‐11/(S)‐12a‐f, respectively, with diastereoselectivities of up to 93.9/6.1.
莰酸酰胺 4 已被三苯基碳鎓四氟硼酸盐 (3) 有效氧化,产生手性 N-酰基胺离子 1。1 与甲硅烷基亲核试剂 7a-c 和 10a-f 的捕获反应进行立体选择性键形成,得到非对映异构体( R)-8/(S)-9a-c 和 (R)-11/(S)-12a-f,分别具有高达 93.9/6.1 的非对映选择性。