P(n-Bu) < inf > 3 < /inf > catalyzed reactions of salicyl n-thiophosphinyl imines with allenylphosphonates: Synthesis of phosphono-chromans

Abstract

A phosphine [P(n-Bu)3]-catalyzed reaction for the synthesis of phosphono-chromans from allenylphosphonates and salicyl N-thiophosphinyl imines has been described and compared with reactions for phosphorus-free allenes. The products are (β,γ)-cyclized and are obtained in good yields (57-83%). A key product is characterized by X-ray crystallography. © 2013 HeteroCorporation.