An Efficient and Straightforward Access to Unprecedented 6-Phosphonoethyl-4H-1,3,2-oxathiaphosphinine-2-sulfides from γ-Keto-δ-alkenylphosphonates/Phosphine Oxides and Lawesson’s Reagent

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Abstract
A simple and efficient approach to novel 4H-1,3,2-oxathiaphosphinine-2-sulfide derivatives bearing a phosphonoethyl group at position 6, was accomplished through the reaction of Lawesson’s reagent with γ-keto-δ-alkenylphosphonates and phosphine oxides. This synthetic strategy, which uses easily prepared γ-keto-δ-alkenylphosphonates/phosphine oxides and commercially available Lawesson’s reagent as starting materials, is endowed with several other advantages such as easy operation, good yields and mild reaction conditions.

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