Synthesis and ring enlargement of 2-ethoxycarbonyl-1-silacyclobutanes
Abstract
2-Ethoxycarbonyl-1-silacyclobutanes were synthesized by intramolecular C–H insertion of carbenes generated photochemically from α-(di-tert-butylsilyl)-α-diazoacetates; they undergo smooth thermal ring-expansion by a 1,3(C → O) silyl shift to form 6-ethoxy-1-oxa-2-silacyclohex-5-enes.