Lipase-mediated diastereoselective and enantioselective acetylations of 3-substituted cyclohexanols
摘要:
Lipase-mediated acetylation of four diastereomeric and enatiomeric isomers of 3-substituted cyclohexanols 2 has led to an efficient resolution to provide a single stereoisomer, (1R,3S)-cyclohexyl acetate (1R,3S)-3 in a high enantiomeric excess. (C) 1998 Elsevier Science Ltd. All rights reserved.
Synthesis and evaluation of guanidinyl pyrrolidines as bifunctional catalysts for enantioselective conjugate additions to cyclic enones
作者:Sunil V. Pansare、Rajinikanth Lingampally
DOI:10.1039/b812038b
日期:——
Guanidinyl pyrrolidines derived from ‘S’-proline are effective catalysts for the enantioselective conjugate addition of malonate, nitroalkane and other carbon and heteroatom nucleophiles to cyclohexenone and cyclopentenone in the absence of basic additives. The stereoselectivity is strongly dependant on catalyst loading as well as reaction concentration.
衍生自“ S ”-脯氨酸的胍基吡咯烷是将丙二酸酯,硝基烷和其他碳原子和杂原子亲核试剂对映选择性共轭加成的有效催化剂。环己烯酮 和 环戊烯酮在没有碱性添加剂的情况下。立体选择性很大程度上取决于催化剂的负载以及反应浓度。
Catalytic Asymmetric Conjugate Addition of Nitroalkanes to Cycloalkenones
作者:Stephen Hanessian、Vinh Pham
DOI:10.1021/ol000170g
日期:2000.9.1
Nitroalkanes add to cyclic and acyclic enones in an enantioselective manner in the presence of catalytic quantities of L-proline and trans-2,5-dimethylpiperazine as excess additive.
A versatile organocatalyst for the asymmetric conjugate addition of nitroalkanes to enones
作者:Claire E. T. Mitchell、Stacey E. Brenner、Steven V. Ley
DOI:10.1039/b511441a
日期:——
5-Pyrrolidin-2-yltetrazole performs as an improved catalyst for the asymmetricaddition of a range of nitroalkanes to cyclic and acyclic enones, with good to excellent enantioselectivity.
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.
Asymmetric multifunctional organocatalytic Michael addition of nitroalkanes to α,β-unsaturated ketones
作者:Pengfei Li、Yongcan Wang、Xinmiao Liang、Jinxing Ye
DOI:10.1039/b804540b
日期:——
Cinchona alkaloid derived primary amine thioureas organocatalyzed Michael addition of nitroalkanes to enones in good yield and up to 98% ee and offered a new way to construct quaternary stereocenters from enones and nitroalkanes.