Sequential hydrostannylation-cyclisation of δ- and ω-allenyl aryl halides. Cyclisation at the proximal carbon

Article abstract of DOI:10.1016/0040-4020(96)00801-0

Palladium catalysed hydrostannylation of (Bu₃SnH, THF, O°C) of δ- and ω-allenyl aryl halides 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 proximal