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.
of copper, rhodium, and gold formulate a one‐pot multistep pathway, which directly gives 2,5‐dihydropyrroles starting from terminal alkynes, sulfonyl azides, and propargylic alcohols. Initially, copper‐catalyzed 1,3‐dipolar cycloaddition of terminal alkynes with sulfonyl azides affords 1‐sulfonyl‐1,2,3‐triazoles, which then react with propargylic alcohols under the catalysis of rhodium. The resulting
Rhodium-Catalyzed Synthesis of 2,5-Epoxybenzo[<i>f</i>][1,4]oxazepines by Tandem Reaction of 1-Sulfonyl-1,2,3-triazoles and Salicylaldehydes
作者:Yinping Shi、Xing Yu、Chuan-Ying Li
DOI:10.1002/ejoc.201500912
日期:2015.9
Readily available 1-sulfonyl-1,2,3-triazoles were converted into α-imino carbenes in the presence of catalytic amounts of rhodium(II) salts. The carbenes underwent a tandemreaction with salicylaldehydes to provide a series of functionalized 2,5-epoxybenzo[f][1,4]oxazepines in high yields.
在催化量的铑 (II) 盐的存在下,容易获得的 1-磺酰基-1,2,3-三唑被转化为 α-亚氨基卡宾。卡宾与水杨醛发生串联反应,以高产率提供一系列功能化的 2,5-环氧苯并 [f][1,4] 氧氮杂。
The stereoselective synthesis of α-amino aldols starting from terminal alkynes
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 2-Substituted 2-Amino Ketones by Rhodium-Catalyzed Reaction of<i>N</i>-Sulfonyl-1,2,3-triazoles with 2-Alkenols
作者:Tomoya Miura、Takamasa Tanaka、Qiang Zhao、Scott G. Stewart、Masahiro Murakami
DOI:10.1002/hlca.201600320
日期:2017.2
A study on a rhodium(II)‐catalyzed reaction of N‐sulfonyl‐1,2,3‐triazoles with 2‐alkenols is reported. The reaction is initiated by insertion of an α‐imino carbene into the O–H linkage of alcohol, forming a 2‐alkenoxy enamide intermediate. A thermal [3,3]‐sigmatropicrearrangement follows to yield 2‐substituted 2‐amino ketone in a stereoselective manner. The successful application of this methodology
Stereoselective Synthesis of 2,3-Dihydropyrroles from Terminal Alkynes, Azides, and α,β-Unsaturated Aldehydes via <i>N</i>-Sulfonyl-1,2,3-triazoles
作者:Tomoya Miura、Takamasa Tanaka、Kentaro Hiraga、Scott G. Stewart、Masahiro Murakami
DOI:10.1021/ja407166r
日期:2013.9.18
A stereoselective method for synthesis of trans-2,3-disubstituted 2,3-dihydropyrroles is reported. N-Sulfonyl-1,2,3-triazoles prepared from terminal alkynes generate α-imino rhodium carbene complexes, which when combined with α,β-unsaturated aldehydes produce trans-2,3-disubstituted dihydropyrroles. The method can be successfully applied to a one-pot process starting from terminal alkynes.