A Novel Palladium-Mediated Cascade Reaction Triggered by Strain Release of the Cyclobutane System. A New General Route to Benzo- and Naphthohydrindans
摘要:
A novel palladium-mediated cascade reaction was reported. By this procedure, the olefinic cyclobutanols 17, 24, and 31; 41; 37; and 45 afforded the benzo-and naphthohydrindans (46-49, 50-53, 54-57, and 58-61) respectively in one operation in the ratios depending on the mediators and solvents employed. This provides a novel and efficient synthesis of biologically important A-nor and C-11-alkylated steroids.
Heteroatom-directed Wacker oxidations. A protection-free synthesis of (−)-heliophenanthrone
作者:Parag Mukherjee、Tarun K. Sarkar
DOI:10.1039/c2ob07095b
日期:——
of (−)-heliophenanthrone has been achieved without any protection–deprotection protocol at an overall yield of 28%. Key features of this synthesis comprise a heteroatom-directed Wackeroxidation of an internalcyclicolefin in addition to asymmetric Brown allylation and ring closing metathesis (RCM).
homologation of unstrained aryl ketones through a formal 1,1-insertion process of olefins, enabled by temporary directing group (TDG)-aided C–C activation. The reaction provides a distinct approach to access various substituted 1-indanones. Computational mechanistic studies reveal that the formal 1,1-insertion is realized by a selective C(sp2)–C(sp3) activation and turnover limiting 2,1-insertion into
A Diversity-Oriented Synthesis of Bicyclic <i>cis</i>-Dihydroarenediols, <i>cis</i>-4-Hydroxyscytalones, and Bicyclic Conduritol Analogues
作者:Parag Mukherjee、Soumya J. Singha Roy、Tarun K. Sarkar
DOI:10.1021/ol100557f
日期:2010.6.4
es, and bicyclic mimics of conduritol. Key features of this protocol include Barrett’s asymmetric hydroxyallylation, ring-closing metathesis (RCM), and completely regioselective Wackeroxidation of internalcyclicolefins.