[2 + 1] Cycloaddition of (E)-1-(phenylseleno)-2-(trimethylsilyl)ethene. Novel cyclopropane ring formation by a 1,2-shift of a trimethylsilyl group
摘要:
Reaction of (E)-1-(phenylseleno)-2-(trimethylsilyl)ethene (1) with vinyl ketones 2a-d in the presence of SnCl4 gave cyclopropane products by a formal [2 + 1] cycloaddition accompanied by 1,2-silicon migration rather than [2 + 2] cycloaddition.