An efficient entry to pyrrolo[1,2-b]isoquinolines and related systems through Parham cyclisation
摘要:
Aryllithiums generated by lithium-iodine exchange undergo intramolecular cyclisation to give pyrrolo[1,2-b]isoquinolines, in high yields. The best results were obtained when Weinreb or morpholine amides were used as internal electrophiles. The procedure has been extended to the preparation of seven and eight membered rings, opening a route to benzazepine and benzazocine skeletons. (c) 2004 Elsevier Ltd. All rights reserved.
Chemoselective Radical Dehalogenation and C–C Bond Formation on Aryl Halide Substrates Using Organic Photoredox Catalysts
作者:Saemi O. Poelma、G. Leslie Burnett、Emre H. Discekici、Kaila M. Mattson、Nicolas J. Treat、Yingdong Luo、Zachary M. Hudson、Shelby L. Shankel、Paul G. Clark、John W. Kramer、Craig J. Hawker、Javier Read de Alaniz
DOI:10.1021/acs.joc.6b01034
日期:2016.8.19
multiple carbon–halogen bonds are still needed. Herein, we report the ability to tune the reduction potential of metal-free phenothiazine-based photoredox catalysts and demonstrate the application of these catalysts for chemoselective carbon–halogen bond activation to achieve C–C cross-coupling reactions as well as reductive dehalogenations. This procedure works both for conjugated polyhalides as well as unconjugated
Intramolecular Carbolithiation Reactions in the Construction of Medium-Sized Rings. Synthesis of Pyrroloisoquinolines, Benzazepines, and Benzazocines
作者:Oihane García-Calvo、Estíbaliz Coya、Sergio Lage、Iain Coldham、Nuria Sotomayor、Esther Lete
DOI:10.1002/ejoc.201200994
日期:2013.3
Subsequent intramolecular carbolithiation of the 2-alkenyl-substituted ortho-lithiated N-benzylpyrroles proceeded efficiently when the alkene was substituted with an electron-withdrawing group. The procedure is applicable to the construction of six-, seven-, and eight-membered rings, thus, opening new routes to pyrroloisoquinolines, benzazepines, and benzazocines. Although the use of (–)-sparteine
Generation of Tertiary and Quaternary Stereocentres through Palladium-Catalysed Intramolecular Heck-Type Reactions for the Stereocontrolled Synthesis of Pyrrolo[1,2-<i>b</i>]isoquinolines
cyclizations proceeded in moderate to good yields (up to 81 %), but with low enantioselectivity when chiral phosphanes such as (R)-BINAP were used as ligands. However, enantiomerically pure 10-substituted pyrrolo[1,2-b]isoquinolines were efficiently obtained by a diastereoselective approach using chiral nonracemic pyrrolidines as substrates, generating a tertiary stereocentre.
An efficient entry to pyrrolo[1,2-b]isoquinolines and related systems through Parham cyclisation
作者:Javier Ruiz、Ainhoa Ardeo、Roberto Ignacio、Nuria Sotomayor、Esther Lete
DOI:10.1016/j.tet.2004.10.105
日期:2005.3
Aryllithiums generated by lithium-iodine exchange undergo intramolecular cyclisation to give pyrrolo[1,2-b]isoquinolines, in high yields. The best results were obtained when Weinreb or morpholine amides were used as internal electrophiles. The procedure has been extended to the preparation of seven and eight membered rings, opening a route to benzazepine and benzazocine skeletons. (c) 2004 Elsevier Ltd. All rights reserved.