Asymmetric synthesis catalyzed by chiral ferrocenylphosphine-transition metal complexes. 3. Preparation of optically active allylsilanes by palladium-catalyzed asymmetric Grignard cross-coupling
The asymmetricallylicsubstitution of allylphosphates with aryl‐ and alkenylboronates catalyzed by a copper/N‐heterocyclic carbene complex was developed and the γ‐substitution products were obtained with high enantioselectivity (see scheme). To account for the observed influence of the reaction parameters a possible catalytic cycle for this process was proposed.
The titanium tetrachloride promoted [3+2] cycloaddition of (R)-(1-phenylprop-2-enyl)trimethylsilane (R)-4 (82% ee) and 1-acetylcyclo-hexene 1 provides an enantiospecific route to the bicyclo[4.3.0]nonane (+)-6.
Enantioselective Synthesis of Allylsilanes Bearing Tertiary and Quaternary Si-Substituted Carbons through Cu-Catalyzed Allylic Alkylations with Alkylzinc and Arylzinc Reagents
作者:Monica A. Kacprzynski、Tricia L. May、Stephanie A. Kazane、Amir H. Hoveyda
DOI:10.1002/anie.200700841
日期:2007.6.11
Regio- and stereoselective α-allylation of quinolines activated by chloroformate and triflate ion by means of chiral allylsilane: a synthesis of chiral 2-substituted 1,2-dihydroquinolines
Addition reactions of a chiral allylsilane to a variety of quinolines activated by phenyl chloroformate and triflate ion proceed with high regio- and stereoselectivities to afford various chiral 2-allylated 1,2-dihydroqLlinolines in good yields. (C) 2002 Elsevier Science Ltd. All rights reserved.
Optically active allylsilanes. 1. Preparation by palladium-catalyzed asymmetric Grignard cross-coupling and anti stereochemistry in electrophilic substitution reactions