Zirconium-Catalyzed Synthesis of Alkenylaminoboranes: From a Reliable Preparation of Alkenylboronates to a Direct Stereodivergent Access to Alkenyl Bromides
A simple procedure has been optimized for the preparation of alkenylaminoborane from alkynes using diisopropylaminoborane and HZrCp2Cl. Coupled with a magnesium-catalyzed dehydrogenation, it allowed for the use of air- and moisture-stable diisopropylamine. This synthesis has been extended to a one-pot sequence leading directly to bromoalkenes with controlled stereochemistry. As such, it provides an
Transfer of alk-1-enyl group from boron to aluminium: a novel way to prepare (E)-alk-1-enyldiisobutylalanes
作者:Masayuki Hoshi、Kazuya Shirakawa
DOI:10.1039/b206541j
日期:2002.9.11
Treatment of (E)-alk-1-enyldicyclohexylboranes 1 with diisobutylaluminium hydride (DIBAL-H) in the presence of hex-1-ene at room temperature results in transfer of the alk-1-enyl group fromboron to aluminium to give (E)-alk-1-enyldiisobutylalanes 2 with retention of configuration at the double bond.
Reactions of copper(I) halide complexes of trivalent phosphorus with vinylic halides
作者:George Axelrad、Surin Laosooksathit、Robert Engel
DOI:10.1021/jo00338a028
日期:1981.12
A new entry of highly nucleophilic CHBr3–TiCl4–Mg system for the stereoselective synthesis of 1-alkenyl bromides
作者:Yeshwant Ramchandra Bhorge、Su-Haur Chang、Cheng-Ta Chang、Tu-Hsin Yan
DOI:10.1016/j.tet.2012.03.123
日期:2012.6
This TiCl4-Mg promoted coupling of CHBr3 with various aldehydes and ketones, especially in sterically hindered or enolizable ketones, provides a simple, practical, and stereoselective carbonyl-bromomethylenation leading primarily to (E)-vinyl bromides. Crown Copyright (C) 2012 Published by Elsevier Ltd. All rights reserved.