Sequential hydrostannylation-cyclisation of δ- and ω-allenyl aryl halides. Cyclisation at the proximal carbon
作者:Ronald Grigg、JoséM Sansano
DOI:10.1016/0040-4020(96)00801-0
日期:1996.10
catalysed hydrostannylation of (Bu3SnH, THF, 0°C) of δ- and ω-allenylarylhalides followed by mono- or bis-cyclisation (MeCN, 80°C) affords small (5–7), large (11–17) and spirocyclic rings in which cyclisation occurs at the proximalcarbon of the orginal allene. The reaction proceeds via stereoselective allylstannane formation. The cyclisation products are α-vinyl oxygen- and nitrogen-heterocycles