Abstract
Abstract Palladium catalysed hydrostannylation of (Bu 3 SnH, THF, 0°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 carbon of the orginal allene. The reaction proceeds via stereoselective allylstannane formation. The cyclisation products are α-vinyl oxygen- and nitrogen-heterocycles.
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