Organolithium-induced synthesis of acyclic unsaturated amino alcohols from epoxides of dihydropyrroles and tetrahydropyridines
摘要:
The alkylative double ring-opening of Bus-protected 2,5-dihydropyrrole epoxides 13 and 29 with organolithiums to give 3-substituted 1-aminobut-3-en-2-ols 13-19 and 30-32 are described. Bus-protected tetrahydropyridine epoxide 38 reacts with organolithiums to give 4-substituted 1-aminobut-4-en-3-ols 39 and tetrahydropyridinol 40. (C) 2003 Elsevier Ltd. All rights reserved.
SUBSTITUTED INTERNAL VINYL-BORONIC ACIDS AND BORONIC ACID DERIVATIVES
申请人:Math Shivanand K.
公开号:US20120041193A1
公开(公告)日:2012-02-16
Disclosed herein are vinyl-bromides, vinyl-boronic acids and vinyl-boronic acid derivatives useful as synthetic intermediates for the preparation of therapeutic agents. Also disclosed are methods of synthesis of vinyl-bromides, vinyl-boronic acids and vinyl-boronic acid derivatives.
Low Catalyst Loadings in Olefin Metathesis: Synthesis of Nitrogen Heterocycles by Ring-Closing Metathesis
作者:Kevin M. Kuhn、Timothy M. Champagne、Soon Hyeok Hong、Wen-Hao Wei、Andrew Nickel、Choon Woo Lee、Scott C. Virgil、Robert H. Grubbs、Richard L. Pederson
DOI:10.1021/ol9029808
日期:2010.3.5
A series of ruthenium catalysts have been screened under ring-closingmetathesis (RCM) conditions to produce five-, six-, and seven-membered carbamate-protected cyclic amines. Many of these catalysts demonstrated excellent RCM activity and yields with as low as 500 ppm catalyst loadings. RCM of the five-membered carbamate series could be run neat, the six-membered carbamate series could be run at 1
已经在闭环复分解 (RCM) 条件下筛选了一系列钌催化剂,以生产五元、六元和七元氨基甲酸酯保护的环胺。许多这些催化剂表现出优异的 RCM 活性和低至 500 ppm 催化剂负载的产率。五元氨基甲酸酯系列的 RCM 可以在 1.0 M 下运行,六元氨基甲酸酯系列可以在 1.0 M 下运行,而七元氨基甲酸酯系列在 0.2-0.05 M 下运行效果最好。