An efficient, asymmetric organocatalyst-mediated conjugate addition of nitroalkanes to unsaturated cyclic and acyclic ketones
作者:Claire E. T. Mitchell、Stacey E. Brenner、Jorge García-Fortanet、Steven V. Ley
DOI:10.1039/b601877g
日期:——
5-Pyrrolidin-2-yltetrazole is a versatile organocatalyst for the asymmetric conjugateaddition of nitroalkanes to enones. Using this catalyst, this transformation requires short reaction times, tolerates a broad substrate scope, and possibly proceeds via generation of an iminium species.
Chiral diethyl (2R)-tetrahydropyrro-2-ylphosphonate is an effective catalyst for the Michael addition of nitroalkanes to alpha,beta-unsaturated ketones. This Study revealed that the hydrate salt of this alpha-aminophosphonate was found to be a better catalytic species. Moderate to high enantioselectivities were achieved in reactions that tolerate various nitroalkanes and enones in the presence of low loading of both catalyst ( 10 mol %) and bulk base (25 mol %). (C) 2008 Published by Elsevier Ltd.
4-trans-Amino-proline based di- and tetrapeptides as organic catalysts for asymmetric C–C bond formation reactions
作者:Svetlana B. Tsogoeva、Sunil B. Jagtap、Zoya A. Ardemasova
DOI:10.1016/j.tetasy.2006.03.012
日期:2006.3
4-trans-Amino-proline based di- and tetrapeptides have been successfully applied as chiral organocatalysts in the enantioselective conjugate addition of nitroalkanes to cyclic enones and the direct aldol reaction. Two 4-trans-amino-proline residues were shown to be sufficient enough to catalyze the conjugate addition reactions with up to 88% ee and up to 100% yield. It has been demonstrated that 4-trans-amino-proline based di- and tetrapeptides are significantly more active than L-proline (at 30 mol %) and can catalyze the direct aldol reaction with good yield and enantioselectivity within 3 h and at lower catalyst loading (5 mol %). (c) 2006 Elsevier Ltd. All rights reserved.
Asymmetric Michael addition of silyl nitronates to cyclic α,β-unsaturated ketones catalyzed by chiral quaternary ammonium bifluorides: isolation and selective functionalization of enol silyl ethers of optically active γ-nitro ketones
Highlyenantioselective Michael addition of silyl nitronates to cyclic α,β-unsaturated ketones has been accomplished by the utilization of N-spiro C2-symmetric chiral quaternary ammonium bifluoride 1 as an efficient catalyst, offering a new route to the enol silyl ethers of optically active γ-nitro ketones. The synthetic utility of this transformation has been demonstrated by the diastereoselective