The attempted stereoselective synthesis of chiral 2,2′-biindoline
摘要:
The attempted first stereoselective synthesis of 2,2'-biindoline using a metathesis-Sharpless asymmetric dihydroxylation strategy results in the synthesis of the heterocycle in poor to modest stereoselectivity. Attempts to improve the ee by varying the heteroatom protecting groups in key intermediates did not enhance the outcome of the Sharpless AD reaction. Therefore a limitation of this AD reaction is the use of 1,4-substituted but-2-enes where these substituents are ortho-substituted aromatics. Crown Copyright (C) 2010 Published by Elsevier Ltd. All rights reserved.
The first syntheses of enantiopure 2,2′-biindoline
作者:Steven M. Wales、Anthony C. Willis、Paul A. Keller
DOI:10.1039/c0cc04045b
日期:——
The first two syntheses of chiral 2,2â²-biindoline are reported either in five steps from 2,2â²-bioxirane, or three steps from 2,2â²-biaziridine, both with exceptional enantiopurity.
The attempted stereoselective synthesis of chiral 2,2′-biindoline
作者:Mary J. Gresser、Steven M. Wales、Paul A. Keller
DOI:10.1016/j.tet.2010.06.035
日期:2010.8
The attempted first stereoselective synthesis of 2,2'-biindoline using a metathesis-Sharpless asymmetric dihydroxylation strategy results in the synthesis of the heterocycle in poor to modest stereoselectivity. Attempts to improve the ee by varying the heteroatom protecting groups in key intermediates did not enhance the outcome of the Sharpless AD reaction. Therefore a limitation of this AD reaction is the use of 1,4-substituted but-2-enes where these substituents are ortho-substituted aromatics. Crown Copyright (C) 2010 Published by Elsevier Ltd. All rights reserved.