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
Cationic rhodium complex-catalysed highly selective hydrosilylation of propynylic alcohols: a convenient synthesis of (E)-γ-silyl allylic alcohols
作者:Ryo Takeuchi、Shuichi Nitta、Dai Watanabe
DOI:10.1039/c39940001777
日期:——
Cationic rhodium compex-catalysed hydrosilylation of alk-1-ynols including propynylic alcohols with triethylsilane is highly selective to give (E)-1-triethylsilyl alk-1-enols as products in excellent yields.
A Selective Synthesis of (E)-Vinylsilanes by Cationic Rhodium Complex-Catalyzed Hydrosilylation of 1-Alkynes and Tandem Hydrosilylation/Isomerization Reaction of Propargylic Alcohols to .beta.-Silyl Ketones
作者:Ryo Takeuchi、Shuichi Nitta、Dai Watanabe
DOI:10.1021/jo00115a020
日期:1995.5
(E)-Vinylsilanes were obtained with high selectivities by [Rh(COD)(2)]BF4/2PPh(3)-catalyzed hydrosilylation of 1-alkynes with triethylsilane. A wide range of 1-alkynes were used. The hydrosilylation of propargylic alcohols with triethylsilane gave (E)-gamma-silyl allylic alcohols 2h-r, a useful source of a chiral alcohol, with high selectivities in excellent yields. The reaction can be carried out without protecting the alcohol functionality. The resulting (E)-gamma-silyl allylic alcohols could be transformed into beta-silyl ketones. The isomerization was also catalyzed by [Rh(COD)(2)]BF4/2PPh(3). Furthermore, the tandem hydrosilylation-isomerization of secondary propargylic alcohols could be carried out in a one-pot procedure.
(E)-丙二烯二硅烷通过使用[Rh(COD)(2)]BF4/2PPh(3)协同催化的水硅化反应获得了高选择性,适用于多种一元炔烃底物。丙炔醇的水硅化反应产生γ-硅基 allylic 醇2h-R,并提供了一种高效产率的构象选择性高的旋多糖醇。该反应无需保护醇的功能性即可进行。由此产生的(E)-γ-硅基 allylic 醇可以通过转化得到β-硅基酮。此外,该[Rh(COD)(2)]BF4/2PPh(3)催化还可以催化丙炔醇的同分异构化反应。Furthermore, a one-pot tandem hydrosilylation-isomerization of secondary propargylic alcohols can be achieved using this approach.
Palladium(II) Complexes of a Neutral CCC-Tris(N-heterocyclic carbene) Pincer Ligand: Synthesis and Catalytic Applications
作者:David Rendón-Nava、Deyanira Angeles-Beltrán、Arnold L. Rheingold、Daniel Mendoza-Espinosa
DOI:10.1021/acs.organomet.1c00324
日期:2021.7.12
tris-azolium precursor 1 with palladium acetate under thermal conditions provided a CCC-pincer palladium(II) complex (2) bearing three NHCs (one imidazolylidene and two triazolylidenes) and one iodide ligand. Further treatment of complex2 with an excess of AgSbF6 generates tris(carbene) dicationic palladium complex3 in which the iodine ligands are exchanged with SbF6 anions and the metal center is stabilized
A route to enantiomerically-enriched α-silyl aldehydes from 2,3-epoxy alcohols
作者:Denise C. Chauret、J.Michael Chong、Qing Ye
DOI:10.1016/s0957-4166(99)00383-3
日期:1999.9
Asymmetric epoxidation of (E)-3-trialkylsilyl-2-propen-1-ols gives the expected epoxides with high enantioselectivity. Ring opening reactions of these epoxides with organocopperreagents furnishes 1,2-diols which are readily cleaved with Pb(OAc)4 to afford α-silyl aldehydes with no detectable loss of stereochemistry.