A New Cyclopentannulation Approach to Bicyclo[3.3.0]octenes Employing a Tandem Michael Addition-[3 + 2]-Anionic Cyclization Sequence
作者:Albert Padwa、Scott H. Watterson、Zhijie Ni
DOI:10.1021/jo00091a006
日期:1994.6
Treatment of 1-substituted dimethyl 1-pentenedioates with base in the presence of 2,3-bis(phenylsulfonyl)-1,3-butadiene results in the formation of bicyclo[3.3.0]octenes. The overall reaction involves a series of three sequential conjugate additions followed by phenyl sulfinate ion ejection.
Novel "Umpolung" in C-C Bond Formation Catalyzed by Triphenylphosphine
作者:Barry M. Trost、Chao-Jun Li
DOI:10.1021/ja00086a074
日期:1994.4
2,3-Bis(phenylsulfonyl)-1,3-butadiene: Substrate for Michael Donor/Acceptors in a Novel Synthesis of Fused Cyclopentenes
作者:Albert Padwa、S. Shaun Murphree、Zhijie Ni、Scott H. Watterson
DOI:10.1021/jo960064l
日期:1996.1.1
formed sulfone-stabilized carbanion is competitive with the intramolecular [3 + 2]-annulation process. The base-induced reaction of dimethyl 2-(methoxycarbonyl)-2-pentenedioate with the bis(phenylsulfonyl)diene was also studied. Even though the position of the acceptor moiety on the pi-bond was altered, the tandem Michael reaction sequence still occurs. The course of the reaction is dependent upon the