Spiro- and bridged-ring forming electrophile induced → oxime → nitrone cycloaddition cascades. Multiplication of chirality
摘要:
Electrophile induced 6-exo-trig spirocyclisation of oximes onto 5-, 6- or 7-membered cycloalkenes occurs stereo- and regio- specifically in good yield. Bridged - ring forming cyclisations creating bicycle-[3.3.1]- and bicyclo-[3.2.1]-ring systems also occur in good yield. Chiral bridged-ring systems have been synthesised, via the latter processes, that involve multiplication of chiral centres from one to six and seven in one pot reactions. (C) 1997 Elsevier Science Ltd.
X=Y–ZH Systems as potential 1,3-dipoles. Part 54: Stereo- and facially-selective formation of bridged bicyclic N-heterocycles via a sequential one-pot electrophile induced oxime→nitrone→cycloaddition sequence. Multiplication of chirality
作者:H Ali Dondas、Ronald Grigg、Sylvie Thibault、W Anthony Thomas、Mark Thornton-Pett
DOI:10.1016/s0040-4020(02)00564-1
日期:2002.7
Electrophileinduced bridged-ring forming cyclisations creating azabicyclo-[3.3.1]- and azabicyclo-[3.2.1]-nitrones, followed by cycloaddition, occur stereo-, regio- and facially specifically in good to excellent yield. Chiral bridged-ring systems have been synthesised that involve multiplication of chiral centres from one to six and one to seven in one pot reactions.