Olefin cyclisations of hindered α-acyliminium ions
作者:B.P. Wijnberg、W.N. Speckamp、A.R.C. Oostveen
DOI:10.1016/0040-4020(82)85067-9
日期:1982.1
imides 2 and 4. HCOOH-Cyclisation of the hydroxylactams affords polycyclic piperidines through stereoselective α-acyliminium ring closure. Concomitant synchronous and stepwise cyclisation pathways are operative in the anti-periplanar addition of tertiary α-acyliminiumions to Me substituted olefins 8c and 11c.