1-Methoxy-2-alkanones are prepared from ate-complexes formed from 1,2-dimethoxyethenyllithium and trialkylboranes by the reaction with BF3:Et2O, followed by basic hydrogen peroxide oxidation.
A transition-metal-free three-component process that combines aldehydes, 3-(tributylstannyl)propargyl acetates formed in situ from readily available propargyl acetates, and trialkylboranes provides access to a range of 1,2,4-trisubstituted homopropargylic alcohols. The addition of diisopropylamine plays a crucial role in the selective formation of homopropargylic alcohols. Importantly, this methodology
Palladium-catalyzed carbonylative cross-coupling of organoboranes with aryl iodides or benzyl halides in the presence of bis(acetylacetonato)zinc(II)
作者:Yoshiaki Wakita、Tomoyuki Yasunaga、Masahiro Akita、Masaharu Kojima
DOI:10.1016/0022-328x(86)80017-1
日期:1986.2
Carbonylative cross-coupling reactions of organoboranes with aryl iodides and benzylhalides successfully catalyzed by dichlorobis(triphenylphosphine)palladium(II) in the presence of bis(acetylacetonato)zinc(II) produce unsymmetrical ketones in reasonable yields.
Photoinduced Carboborative Ring Contraction Enables Regio- and Stereoselective Synthesis of Multiply Substituted Five-Membered Carbocycles and Heterocycles
作者:Shengfei Jin、Vu T. Nguyen、Hang T. Dang、Dat P. Nguyen、Hadi D. Arman、Oleg V. Larionov
DOI:10.1021/jacs.7b07128
日期:2017.8.23
herein a photoinduced carboborative ringcontraction of monounsaturated six-membered carbocycles and heterocycles. The reaction produces substituted five-membered ring systems stereoselectively and on preparative scales. The products feature multiple stereocenters, including contiguous quaternary carbons. We show that the reaction can serve as a synthetic platform for ring system alteration of natural products
作者:Herbert C. Brown、M.Mark Midland、Alan B. Levy、H.C. Brown、R.B. Wetherill、Akira Suzuki、Sunao Sono、Mitsuomi Itoh
DOI:10.1016/s0040-4020(01)83446-3
日期:1987.1
excellent yields of secondary amines. Furthermore, the stereochemistry of the original carbon-boron bond is retained. The mechanism of these reactions is discussed and the reaction applied to the synthesis of N-alkyl- and N-arylaziridines.