Stereoselective synthesis of (E)-β-arylvinyl bromides by microwave-induced reaction of anti-3-aryl-2,3-dibromopropanoic acids using an AgOAc–AcOH system
Convenient and stereoselective synthesis of (Z)-1-bromo-1-alkenes by microwave-induced reaction
摘要:
(Z)-l-Bromo-l-alkenes were stereoselectively prepared in high yields in a short reaction time (0.2 1.0 min) by microwave irradiation of the corresponding 2,3-dibromoalkanoic acids in DMF in the presence of triethylamine. (C) 2001 Elsevier Science Ltd. All rights reserved.
Ionic Liquid–Promoted Stereoselective Synthesis of (<i>Z</i>)‐Vinyl Bromides by [bmIm]OH under Organic Solvent–Free Conditions: A Green Approach
作者:Brindaban C. Ranu、Subhash Banerjee、Jhinuk Gupta
DOI:10.1080/00397910701471386
日期:2007.8.1
Abstract A simple and easily accessible ionicliquid, 1‐butyl‐3‐methylimidazolium hydroxide ([bmIm]OH), has been demonstrated as an efficient promoter and reaction medium for the highlystereoselective synthesis of (Z)‐vinyl bromides by the debrominative decraboxylation of dibrominated α,β‐unsaturated carboxylic acids in high yields. The reaction does not require either a conventional base or an organic
(Z)-1-Bromo-1-alkenes were stereoselectively prepared in high yields in a short reaction time by microwave irradiation of the corresponding anti-2,3-dibromoalkanoic acids in a Et3N/DMF system. A one-pot synthesis of terminal alkynes and enynes from 2,3-dibromoalkanoic acids were also developed by microwave-induced reaction. (c) 2005 Elsevier Ltd. All rights reserved.
Synthesis applications of cationic aza-Cope rearrangements. Part 25. Total synthesis of Amaryllidaceae alkaloids of the 5,11-methanomorphanthridine type. Efficient total syntheses of (-)-pancracine and (.+-.)-pancracine
作者:Larry E. Overman、Jaechul Shim
DOI:10.1021/jo00069a032
日期:1993.8
Stereocontrolled total syntheses of the 5,11-methanomorphanthridine alkaloid pancracine in racemic (rac-1) and natural levorotatory form (1) are described. The key step is a Lewis acid-mediated aza-Cope rearrangement-Mannich cyclization reaction (9 --> 6, Scheme I).
Kuang, Chunxiang; Yang, Qing; Senboku, Hisanori, Journal of Chemical Research, 2005, # 5, p. 282 - 284