Heteroannulation of Alkynyl Carbene Complexes: [3+2] Dipolar Cycloaddition of Pentacarbonyl-[(Alkynyl)(Methoxy)Carbene]Metals with Masked 1,3-Dipoles

Abstract
Pentacarbonyl[(alkynyl)(methoxy)carbene]metals undergo [3+2] dipolar cycloaddition on treatment with masked azomethine imine or azimine ylides to give pentacarbonyl[(alkyl or arylheteryl)(methoxy)carbene]metals in good yields (40-85%).