Enantioselective Organocatalytic Singly Occupied Molecular Orbital Activation: The Enantioselective α-Enolation of Aldehydes
作者:Hye-Young Jang、Jun-Bae Hong、David W. C. MacMillan
DOI:10.1021/ja0719428
日期:2007.6.6
e products with uniformly high levels of asymmetric induction. Wide latitude in both the aldehyde and enolsilane component is readily accommodated, allowing generic access to a diverse assortment of enantioenriched 1,4-dicarbonyl compounds. This report highlights the potential of SOMO catalysis to enable the development of entirely new classes of asymmetric reactions that have no traditional catalytic
One-pot synthesis of tropinone by tandem (domino) ene-type reactions of acetone silyl enol ethers
作者:Koichi Mikami、Hirofumi Ohmura
DOI:10.1039/b208066d
日期:2002.11.4
A syntheticapproach for tropane alkaloids on the basis of tandem (domino) ene-type reactions of acetone silyl enol ethers with iminium ions is shown to be triggered by intermolecular ene-type reactions followed by 6-(2,5) silatropic ene-type cyclizations.
Gold-Acetonyl Complexes: From Side-Products to Valuable Synthons
作者:Danila Gasperini、Alba Collado、Adrián Goméz-Suárez、David B. Cordes、Alexandra M. Z. Slawin、Steven P. Nolan
DOI:10.1002/chem.201406543
日期:2015.3.27
formation of complexes, such as [Au(IPr)(CH2COCH3)]. The approach capitalizes on the formation of a decomposition product observed in the course of the synthesis of [Au(IPr)(Cl)]. A library of gold acetonyl complexes containing the most common N‐heterocycliccarbene (NHC) ligands has been synthesized. These acetonyl complexes are good synthons for the preparation of numerous organogold complexes. Moreover
complex-catalyzed ketoester-ene reaction with silyl enol ether can be achieved to produce an ene product with a quaternary carbon center in high yield and enantioselectivity. Even lower catalyst loading (up to 0.01 mol%) can be performed without a significant decrease in yield and enantioselectivity; this will open doors to industrial applications of chiral Lewisacidcatalysis.
Regio- and Stereospecific Cleavage of Silyl- and Disilylepoxides with Lithium Diphenylphosphide
作者:Purificación Cuadrado、Ana M. González-Nogal、M. Angeles Sarmentero
DOI:10.1002/chem.200400239
日期:2004.9.20
react stereospecifically with lithium diphenylphosphide, optionally followed by methylation, to give vinylphosphonium iodides or vinylphosphine oxides resulting from alpha-opening and silylenolethers, vinylsilanes or alpha-hydroxysilanes by beta-opening. On the other hand, alpha,beta- or alpha,alpha-disilylepoxides afforded beta-silyl vinylphosphine oxides or alpha-silylated silylenolethers by alpha-