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
The first photo-mediated process enabling the generation of halide radicals by halogen-atom transfer (XAT) is described. This novel reactivity pattern relies on the use of 1,2-dihaloethanes for the generation of unstable carbon radicals by XAT, which after β-scission, release halide radicals that have been used in selective hydrohalogenations of unsaturated hydrocarbons.
METHOD FOR PREPARING ALKENYL AMINOBORANES AND THEIR DERIVATIVES, AND USES THEREOF
申请人:UNIVERSITE DE BORDEAUX
公开号:US20220396591A1
公开(公告)日:2022-12-15
Disclosed is a method for preparing alkenyl aminoboranes and their derivatives, and uses thereof. The method for preparing alkenyl aminoboranes includes contacting, preferably in a single synthesis step, a terminal alkyne, an aminoborane and a catalyst chosen from Schwartz's reagent (Cp2ZrHCl), dicyclohexylborane (HBCy), diisopinocamphenylborane (HBipc2) and 9-Borabicyclo(3.3.1)nonane (9-BBN).
Vinylic organoboranes. 13. A convenient stereospecific synthesis of (Z)-1-halo-1-alkenes from 1-alkynes via (E)-1-alkenylborane derivatives with halogens
作者:Herbert C. Brown、Chitti Subrahmanyam、Tsutomu Hamaoka、Nair Ravindran、Donald H. Bowman、Soichi Misumi、Maniketh K. Unni、Vishwanatha Somayaji、Narayan G. Bhat
DOI:10.1021/jo00287a018
日期:1989.12
Kabalka, George W.; Sastry, Kunda A. R.; Knapp, Furn, F., Synthetic Communications, 1983, vol. 13, # 12, p. 1027 - 1032
作者:Kabalka, George W.、Sastry, Kunda A. R.、Knapp, Furn, F.、Srivastava, Prem C.