RETRACTED: Catalytic C–CN activation and asymmetric cyanoamidation of alkenes: total syntheses of (+)-horsfiline, (−)-coerulescine, and (−)-esermethole
作者:Venkata Jaganmohan Reddy、Christopher J. Douglas
DOI:10.1016/j.tet.2010.02.096
日期:2010.6
This article has been retracted: please see Elsevier Policy on Article Withdrawal (http://www.elsevier.com/locate/withdrawalpolicy). This article has been retracted at the request of the author. The author has discovered some irregularities in unpublished data related to the chemistry described in this paper. This discovery prompted the author to conduct a thorough review of the above manuscript. As
The five- to seven-membered alpha-alkylidene lactams were prepared in 45-99% yield by the palladium-catalyzed cyanoamidation of alkynyl cyanoformamides. The reaction proceeded exclusively in a 5-exo mode, giving the corresponding (Z)-alkenes as major products. The reaction was also applied to 1,1-disubstituted alkenes to afford oxindoles bearing a quaternary carbon center.
Intramolecular cyanoamidation of unsaturated cyanoformamides catalyzed by palladium: an efficient synthesis of multi-functionalized lactams
The Pd(0)-catalyzed intramolecular cyanoamidation of several unsaturated cyanoformamides with alkenyl, allenyl, and alkynylgroups was investigated. In the cases of alkynyl and 1,1-disubstituted alkenyl cyanoformamides, the Pd(0)-catalyzed C–CN activation and subsequent insertion reaction proceeded smoothly and gave the corresponding lactams bearing a cyano group at the β-position in good yields. The
Highly Enantioselective Intramolecular Cyanoamidation: (+)-Horsfiline, (−)-Coerulescine, and (−)-Esermethole
作者:Venkata Jaganmohan Reddy、Christopher J. Douglas
DOI:10.1021/ol902949d
日期:2010.3.5
octahydro-MonoPhos allowed the production of oxindoles with high enantioselectivities. Cyanoformamides bearing free N−H groups are now tolerated, potentially allowing protecting-group-free synthesis. Oxindole products of cyanoamidation are rapidly transformed into (+)-horsfiline, (−)-coerulescine, and (−)-esermethole.