Please login first
Base-Promoted Ring Contraction of Dihydrodiazepinones to Pyrrolinones
* ,
1  N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 47 Leninsky Ave., 119991 Moscow, Russian Federation

Abstract: A novel synthesis of 2,3-dihydro-1H-1,3-diazepin-2-ones based on thermal elimination of methanol from 4-methoxy-2,3,4,5-tetrahydro-1H-1,3-diazepin-2-ones has been developed. The prepared dihydrodiazepinones underwent a new rearrangement under basic conditions to give 3-(aminomethylene)-2,3-dihydro-1H-pyrrol-2-ones. Plausible mechanism for the rearrangement is proposed.
Keywords: 1H-1,3-Diazepin-2-ones; ring contraction; 2,3-dihydro-1H-pyrrol-2-ones; anti-aromaticity