Cobalt‐Catalyzed Aminocarbonylation of Alkyl Tosylates: Stereospecific Synthesis of Amides
作者:Brendon T. Sargent、Erik J. Alexanian
DOI:10.1002/anie.201905173
日期:2019.7.8
functionality in chemical synthesis. Despite broad application of this transformation using aryl or vinyl electrophiles, there are few examples involving unactivated aliphatic substrates. Furthermore, there are no stereocontrolled aminocarbonylations of alkyl electrophiles known. Herein, we report a stereospecific aminocarbonylation of unactivated alkyl tosylates for the synthesis of enantioenriched amides
Asymmetric Reduction of Prochiral Ketones by Using Self-Sufficient Heterogeneous Biocatalysts Based on NADPH-Dependent Ketoreductases
作者:Ana I. Benítez-Mateos、Eneko San Sebastian、Nicolás Ríos-Lombardía、Francisco Morís、Javier González-Sabín、Fernando López-Gallego
DOI:10.1002/chem.201703475
日期:2017.11.27
integrated into a plug flow reactor for the continuous synthesis of one model secondary alcohol, which gave rise to a space‐time yield of 97–112 g L−1 day−1; additionally, the immobilized cofactor accumulated a total turnover number of 1076 for 120 h. This is one of the few examples of the successful implementation of continuousreactions in aqueous media catalyzed by cell‐free and immobilized systems that
无细胞和自给自足的生物催化系统的开发代表了一种在非生理条件下解决更复杂的合成方案的新兴方法。在本文中,我们报道了无需添加外源辅因子即可用于合成手性醇的自足多相生物催化剂的开发。在这项工作中,主要稳定了NADPH依赖的酮还原酶,并将其与NADPH进一步共固定化,以催化不对称还原反应,而无需添加外源性辅因子。结果,固定辅因子是可及的,因此,如操作研究中的单颗粒所示,它可以在多孔结构内部循环而不扩散到主体中。ee ; 在五个连续的反应周期中保持了这种高性能。同样,自足的非均相生物催化剂被集成到活塞流反应器中,以连续合成一种模型仲醇,从而产生了97–112 g L -1 day -1的时空产率;此外,固定化辅因子在120小时内累积了1076的总周转数。这是在无细胞和固定化系统(将酶和辅因子都整合到固相中)的催化下,在水性介质中成功进行连续反应的少数几个例子之一。
Chemistry of baker's yeast reduction products: Use of optically active (S)-(+)-1-(p-toluenesulfonyl)propan-2-ol and (S)-(+)-1-(phenylsulfonyl)propan-2-ol in synthesis.
作者:Alan P. Kozikowski、B.B. Mugrage、C.S. Li、L. Felder
DOI:10.1016/s0040-4039(00)85071-6
日期:1986.1
The utility of the title compounds in the preparation of opticallyactive lactones and alcohols is detailed.
详细说明了标题化合物在制备光学活性内酯和醇中的用途。
Kinetic resolution of racemic hydroxy ester via asymmetric catalytic hydrogenation and application thereof
申请人:Zhejiang Jiuzhou Pharmaceutical Co., Ltd
公开号:US20170334831A1
公开(公告)日:2017-11-23
The present invention relates to kinetic resolution of racemic δ-hydroxyl ester via asymmetric catalytic hydrogenation and an application thereof. In the presence of chiral spiro pyridyl phosphine ligand Iridium catalyst and base, racemic δ-hydroxyl esters were subjected to asymmetric catalytic hydrogenation to obtain extent optical purity chiral δ-hydroxyl esters and corresponding 1,5-diols. The method is a new, efficient, highly selective, economical, desirably operable and environmentally friendly method suitable for industrial production. An optically active chiral δ-hydroxyl ester and 1,5-diols can be obtained at very high enantioselectivity and yield with relatively low usage of catalyst. The chiral δ-hydroxyl ester and 1,5-diols obtained by using the method can be used as a critical raw material for asymmetric synthesis of chiral drugs (R)-lisofylline and natural drugs (+)-civet, (−)-indolizidine 167B and (−)-coniine.
Enzymatic kinetic resolution of internal propargylic diols. Part I: a new approach for the synthesis of (S)-pent-2-yn-1,4-diol, a natural product from Clitocybe catinus
作者:Jeiely G. Ferreira、Cleverson R. Princival、Dyego M. Oliveira、Renata X. Nascimento、Jefferson L. Princival
DOI:10.1039/c5ob00386e
日期:——
Employing a two round sequence EKR, mono- and bis-acetoxy propargylic products were obtained in a high enantiomeric ratio (E > 200). The efficiently resolved chiral 8b was applied in a concise synthesis of (S)-1b, an optically active natural product produced by fungi Clitocybe catinus.