Stereoselective electrophile-induced mono- and bis-cyclisation–fragmentation reactions of alkenyl oxime O-allyl and O-benzyl ethers. Synthesis of dihydropinidine
作者:H Ali Dondas、Ronald Grigg、Jasothara Markandu、Trevor Perrior、Tekka Suzuki、Sylvie Thibault、W Anthony Thomas、Mark Thornton-Pett
DOI:10.1016/s0040-4020(01)01118-8
日期:2002.1
Phenylseleny bromide-induced cyclisation of γ- and δ-unsaturated aldoxime and ketoxime O-allyl and O-benzyl ethers is followed by a slow fragmentation of the resultant oxyiminium ions furnishing cyclic iminium salts which are readily reduced to pyrrolidines, piperidines or tetrahydroisoquinolines by sodium borohydride; dialkenyl oximes yield indolizidines and quinolizidines by an analogous sequence
苯硒基溴诱导的γ-和δ-不饱和醛肟和酮肟O-烯丙基和O-苄基醚的环化反应,然后缓慢氧化所得的氧亚胺离子,得到环状亚胺盐,这些亚胺盐很容易被钠还原为吡咯烷,哌啶或四氢异喹啉硼氢化物 二烯基肟通过在汞(II)诱导的环化反应中终止的类似序列产生吲哚并咪唑和喹喔啉。