Reactions of carbonyl compounds with (monohalo) methyleniminium salts (vilsmeier reagents)

A one-pot synthesis of new variously substituted γ-chloro-γ, β-allylic carbamates have been carried out starting from β-chloro-α, β-unsaturated aldehydes. The new carbamates and the corresponding intermediates, the γ-chloro-γ, β-allylic alcohols, were fully characterized by (1H and 13C) NMR, IR and HRMS spectroscopic techniques. The crystal structures of two allylic carbamates, were established by single-crystal X-ray diffraction.