Highly Enantioselective Henry Reactions in Water Catalyzed by a Copper Tertiary Amine Complex and Applied in the Synthesis of (S)-N-trans-Feruloyl Octopamine
作者:Guoyin Lai、Fengfeng Guo、Yueqin Zheng、Yang Fang、Haigang Song、Kun Xu、Sujing Wang、Zhenggen Zha、Zhiyong Wang
DOI:10.1002/chem.201002915
日期:2011.1.24
It's in the water! A new coppertertiaryaminecomplex was prepared and applied in asymmetric Henryreactions in water and in the short synthesis of (S)‐N‐trans‐feruloyl octopamine. This catalytic system provided an approach to the enantioselectiveHenryreaction of aldehydes with hydroxyl substituents (see graphic).
A new type of di-site chiralphase transfer catalyst has been designed and synthesized from cinchona alkaloids as a chiral precursor. The prepared catalysts are applied in the asymmetric Henry reaction to a wide range of aldehydes using mild concentrations of a base and solvent and under room-temperature conditions. Under the optimized reaction conditions, the highest chemical yields up to 99% along
Lipase catalysed resolution of nitro aldol adducts
作者:Menno J Sorgedrager、Rita Malpique、Fred van Rantwijk、Roger A Sheldon
DOI:10.1016/j.tetasy.2004.02.025
日期:2004.4
The kinetic resolution of a range or 1-nitro-2-alkanols by lipase-catalysed esterification using various lipases and succinic anhydride as an acyl donor has been studied. E values of up to 100 were obtained with Novozym 435 in the resolution of 1-nitro-2-pentanol with succinic anhydride in TBME. Acylation with succinic anhydride proved much more enantioselective than with vinyl acetate. (C) 2004 Elsevier Ltd. All rights reserved.
Nakamura, Kaoru; Inoue, Yoshihiko; Kitayama, Takashi, Agricultural and Biological Chemistry, 1990, vol. 54, # 6, p. 1569 - 1570
Asymmetric syntheses of pheromones for Bactrocera nigrotibialis, Andrena wilkella, and Andrena haemorrhoa F from a chiral nitro alcohol
作者:Takashi Kitayama
DOI:10.1016/0040-4020(96)00244-x
日期:1996.4
1-nitro-2-propanol (1), in natural products syntheses was examined. Opticallypure (+)−1 was readily, prepared by the lipase-catalyzed stereoselective transesterification of (±)−1. The following Michael addition of TBDMS ether of (+)-1 to methyl vinyl ether or acrylonitrile afforded important synthetic intermediates, 3a and b. As a result, opticallypure sex pheromones for Bactrocera nigrotibialis