ChemInform Abstract: Reactions of 2‐Methylene‐1,5‐diphenyl‐1,5‐pentanediones with CH Acids.

Abstract

Reactions of 2-Methylene-1,5-diphenyl-1,5-pentanediones with CH Acids.-In the reaction of title methylenediphenylpentanediones (I) and (XI) with various malonate-derived CH-acids, a wide variety of reaction products is obtained depending on the substitution pattern of both educts. Thus, with the 3,4-unsubstituted pentanedione (I) a cyclization proceeds subsequently after the initial adduct formation, but involvement of the nitrile or carbonyl functionalities of CH-acids generates a different product in every case. In the case of fully substituted pentanediones (XI), cyclization proceeds only with acetoacetate (VI), while with the other CH-acids the initial Michael adduct is isolated. -(BAGRINA, N. P.; PAVEL, G. V.; TILICHENKO, M. N.; VYSOTSKII, V. I.; Russ.