stable vinyllic gold intermediates. Optimization lead to isolated yields of up to 98 %, using 2‐(di‐tert‐butylphosphino)biphenyl as the ligand. This transformation is derived from a silyl rearrangement that can be fully controlled according to the nature of the substituent on the ynone. This selective transformation does not require basic conditions to prevent protodeauration. These vinylgold complexes
Stereocontrolled synthesis of α-trialkylsilyl-β, γ-unsaturated aldehydes via palladium (0) catalysis. Synthetic usefulness
作者:Franck Le Bideau、Fabienne Gilloir、Ylva Nilsson、Corinne Aubert、Max Malacria
DOI:10.1016/0040-4020(96)00264-5
日期:1996.5
The reaction of silicon substituted vinyloxiranes in the presence of catalytic amount of palladium (0) catalyst affords the title compounds. This new reaction proceeds smoothly, under very mild conditions and with complete chirality transfer. One-pot addition of selected organometallic nucleophiles to these aldehydes at very low temperature led to a highly selective preparation of the corresponding
A catalyst-free method for the highly regioselective chloroboration of allenylsilanes is described. In the presence of BCl3 and 2,6-lutidine, chloroboration of allenylsilanes proceeds smoothly without any catalyst, and the product could be treated with pinacol to afford the corresponding pinacol borates in one-pot reaction. This reaction provides a direct approach to construct valuable 2-silylallylboronate
The carboxylation of propargylic alcohols containing a silyl group at the terminal position was conducted in a CO2 atmosphere at atmospheric pressure in the presence of a nickel catalyst and diethylzinc. Here, CO2 was used as not only the C1 source but also the promoter of the C–OH cleavage processes for the oxidative addition of propargylic alcohols.
Studies on retro-[1,4] Brook rearrangement of 3-silyl allyloxysilanes. Observation of the formation of unusual 3,3-bissilyl enols
作者:Zubao Gan、Ya Wu、Lu Gao、Xianwei Sun、Jian Lei、Zhenlei Song、Linjie Li
DOI:10.1016/j.tet.2012.06.005
日期:2012.8
Detailed investigations of the retro-[1,4] Brook rearrangement of 3-silyl allyloxysilanes are described. Based on control experiments and NMR studies, rationalizations are proposed for the formation of 3,3-bissilyl enols, unusual compounds that are stable to acidic hydrolysis but that can be transformed into the corresponding aldehydes under basic hydrolysis conditions. These studies further show that