BF3Etherate Mediated 1,4-Addition Reaction of (1-Alkenyl)dialkoxyboranes to α-Acyl-α,β-unsaturated Esters
摘要:
In the, presence of BF3 etherate, (1-alkenyl)dialkoxyboranes react with alpha-acyl-alpha,beta-unsaturated esters to give alpha-acyl-gamma,delta-unsaturated esters in good yields.
A stereoselective synthesis of γδ-unsaturated ketones possessing perfluoroalkyl groups by trifluoroborane etherate mediated 1,4-addition reaction of alkenyldiisopropoxyboranes to α,β-unsaturated ketones
作者:Ei-ichi Takada、Shoji Hara、Akira Suzuki
DOI:10.1016/s0040-4039(00)61600-3
日期:1993.10
A variety of γ,δ-unsaturated ketones (3,5, and 7) having perfluoroalkyl groups were prepared stereoselectively by the trifluoroborane etherate mediated 1,4-addition reaction of alkenyldiisopropoxyboranes (1) to α,β-unsaturatedketones substituted by perfluoroalkyl group (2,4, and 6). The undesired 1,2-addition of alkenyl groups or elimination of metal fluoride from the adducts could be avoided completely
Synthesis of Functionalized Allylsilicone Compounds via Rhodium-Catalyzed Conjugate Addition of (E)- or (Z)-[3-Trimethylsilyl-1-propenyl]boronic Acids to Enones
The rhodium-catalyzed conjugate addition of (E)-Me 3 SiCH 2 CH=CHB(iPrO) 2 or (Z)-Me 3 SiCH 2 (C 4 H 9 )C=CHB(iPrO) 2 to enones provided a novel method for the synthesis of allylsilicone compounds possessing a carbonyl group inthe same molecule, which are versatile intermediates for intramolecular allylsilylation, giving cyclobutanols on treatment with Bu 4 NF.
(E)-Me 3 SiCH 2 CH=CHB(iPrO) 2 或(Z)-Me 3 SiCH 2 (C 4 H 9 )C=CHB(iPrO) 2 与烯酮的铑催化共轭加成提供了一种新方法用于合成在同一分子中具有羰基的烯丙基硅氧烷化合物,这些化合物是分子内烯丙基甲硅烷基化的通用中间体,用 Bu 4 NF 处理得到环丁醇。
Stereospecific Synthesis of Vinyl(phenyl)iodonium Tetrafluoroborates via Boron-Iodane Exchange of Vinylboronic Acids and Esters with Hypervalent Phenyliodanes
Reaction of vinylboronic acids and esters with hypervalent phenyliodanes in the presence of BF3-Et2O undergoes boron-iodane exchange at O degrees C in dichloromethane yielding vinyl(phenyl)iodonium tetrafluoroborates stereoselectively with retention of configuration. (C) 1997 Elsevier Science Ltd.
Bf3 etherate mediated 1,4-addition of 1-alkenyldialkoxyboranes to α,β-unsaturated ketones. A stereoselective synthesis of γ, δ-Unsaturated ketones