Organophosphorus compounds, part 149. Preparation of 1,3-oxaphospholes by transition metal-catalyzed reactions of alpha-diazo-beta-dicarbonyl compounds with tert-butylphosphaacetylene

摘要

In the presence of Rh-2(OAc)(4) as catalyst the cyclic alpha-diazo-beta-dicarbonyl compounds 7a-c react with tert-butylphosphaacetylene 2 under elimination of nitrogen to furnish the 1,3-oxaphosphole derivatives 8a-c. The feasible competing reaction with formation of the 1,2,4-diazaphospholes 9a-c has not been observed. [References: 21]