[3 + 2] Annulation of β-Heteroatom-Substituted α,β-Unsaturated Acylsilanes with Methyl Ketone Enolates: Scope and Investigation of the Reaction Course

Abstract
A new route to (Z)-β-silylacryloylsilanes 10 and the improved conditions for the [3 + 2] annulation using 10 and alkyl methyl ketone enolates are reported. Also, details of investigations defining a reaction course of the [3 + 2] annulation using β-phenylthio- and β-trimethylsilyl-acryloylsilanes 1 (X = SPh, SiMe3) and alkyl methyl ketone enolates are described.