Synthesis of α-Amino Ketones from Terminal Alkynes via Rhodium-Catalyzed Denitrogenative Hydration of N-Sulfonyl-1,2,3-triazoles
摘要:
N-Sulfonyl-1,2,3-triazoles react with water in the presence of a rhodium catalyst to produce alpha-amino ketones in high yield. An intermediary alpha-imino rhodium(II) carbenoid undergoes insertion into the O-H bond of water. This transformation formally achieves 1,2-aminohydroxylation of terminal alkynes in a regioselective fashion when combined with the copper(I)-catalyzed 1,3-dipolar cycloaddition with N-sulfonyl azides.
Rh-Catalyzed Transannulation of <i>N</i>-Tosyl-1,2,3-Triazoles with Terminal Alkynes
作者:Buddhadeb Chattopadhyay、Vladimir Gevorgyan
DOI:10.1021/ol2014347
日期:2011.7.15
The first transannulation of 1,2,3-triazoles with terminal alkynes into pyrroles is reported. The reaction proceeds in the presence of a Rh2(oct)4/AgOCOCF3 binary catalyst system providing a straightforward approach to 1,2,4-trisubstituted pyrroles in good to excellent yields.
A new procedure for the stereoselective synthesis of syn alpha-amino beta-oxy ketones is reported. It consists of two steps; in the first step, alpha-amino silyl enol ethers having a (Z) geometry are prepared from 1-alkynes via 1-sulfonyl-1,2,3-triazoles. In the second step, the silyl enol ethers undergo the TiCl4-mediated Mukaiyama aldolreaction with aldehydes to produce alpha-amino beta-oxy ketones
Synthesis of Penta-2,4-dien-1-imines and 1,2-Dihydropyridines by Rhodium-Catalyzed Reaction of <i>N</i>-Sulfonyl-1,2,3-triazoles with 2-(Siloxy)furans
作者:Yuuta Funakoshi、Tomoya Miura、Masahiro Murakami
DOI:10.1021/acs.orglett.6b03143
日期:2016.12.16
A rhodium(II)-catalyzed reaction of N-sulfonyl-1,2,3-triazoles with 2-(siloxy)furans is reported. Either open-chain penta-2,4-dien-1-imines or cyclic 1,2-dihydropyridines are selectively obtained depending on the ligand on rhodium(II).
Rhodium-Catalyzed Transannulation of 1,2,3-Triazoles with Nitriles
作者:Tony Horneff、Stepan Chuprakov、Natalia Chernyak、Vladimir Gevorgyan、Valery V. Fokin
DOI:10.1021/ja805079v
日期:2008.11.12
Stable and readily available 1-sulfonyl triazoles are converted to the corresponding imidazoles in good to excellent yields via a rhodium(II)-catalyzed reaction with nitriles. Rhodium iminocarbenoids are proposed intermediates.
Rhodium(II)-catalyzed transannulation of 1-sulfonyl-1,2,3-triazoles with 2 H -azirines: a new method to dihydropyrazines
作者:Haixin Ding、Sanguo Hong、Ning Zhang
DOI:10.1016/j.tetlet.2014.12.032
日期:2015.1
An efficient rhodium(II)-catalyzed transannulation method of 1-sulfonyl-1,2,3-triazoles with 2H-azirines has been utilized for the synthesis of phenyl-substituted dihydropyrazines. The dihydropyrazine products can be further converted to pyrazines under basic conditions in excellent yield. (C) 2014 Published by Elsevier Ltd.