Asymmetric Inter- and Intramolecular Cyclopropanation Reactions Catalyzed by a Reusable Macroporous-Polymer-Supported Chiral Ruthenium(II)/Phenyloxazoline Complex
Along came poly: A novel macroporous polymer‐supported chiral RuII/pheox catalyst (1, see SEM image) afforded excellent reactivity and enantioselectivity in inter‐ and intramolecular cyclopropanation reactions with a broad range of substrates. The catalyst showed no leaching and could be reused up to 11 times, even after storage.
随之而来的是聚:一种新型的大孔聚合物负载的手性Ru II / pheox催化剂(1,参见SEM图片)在与多种底物的分子间和分子内环丙烷化反应中具有出色的反应性和对映选择性。该催化剂没有浸出,即使在储存后也可以重复使用多达11次。
Asymmetric Synthesis of Chiral Primary Amines by Transfer Hydrogenation of <i>N</i>-(<i>tert</i>-Butanesulfinyl)ketimines
作者:David Guijarro、Óscar Pablo、Miguel Yus
DOI:10.1021/jo101057s
日期:2010.8.6
The diastereoselective reduction of (R)-N-(tert-butanesulfinyl)ketimines by a ruthenium-catalyzed asymmetrictransferhydrogenation process in isopropyl alcohol, followed by desulfinylation of the nitrogen atom, is an excellent method to prepare highly enantiomerically enriched α-branched primary amines (up to >99% ee) in short reaction times (1−4 h). (1S,2R)-1-Amino-2-indanol has been shown to be
Highly Diastereoselective and Enantioselective Olefin Cyclopropanation Using Engineered Myoglobin-Based Catalysts
作者:Melanie Bordeaux、Vikas Tyagi、Rudi Fasan
DOI:10.1002/anie.201409928
日期:2015.2.2
Using rational design, an engineered myoglobin‐based catalyst capable of catalyzing the cyclopropanation of aryl‐substituted olefins with catalytic proficiency (up to 46 800 turnovers) and excellent diastereo‐ and enantioselectivity (98–99.9 %) was developed. This transformation could be carried out in the presence of up to 20 g L−1 olefin substrate with no loss in diastereo‐ and/or enantioselectivity
通过合理的设计,开发了一种工程化的基于肌红蛋白的催化剂,该催化剂能够催化芳基取代的烯烃的环丙烷化,具有催化能力(高达46 800次营业额)和出色的非对映和对映选择性(98–99.9%)。该转化可在不超过20 g L -1烯烃底物的存在下进行,且非对映选择性和/或对映选择性不损失。诱变和机理研究支持由亲电的血红素结合的卡宾物质介导的环丙烷化机理,并提供了一个模型来合理化蛋白质催化剂的立体偏好。这项工作表明,肌红蛋白是开发具有卡宾转移反应性的生物催化剂的有前途和强大的支架。
Highly stereoselective Ru(ii)–Pheox catalyzed asymmetric cyclopropanation of terminal olefins with succinimidyl diazoacetate
The Ru(II)âPheox complex is an efficient catalyst for the intermolecular cyclopropanation of various terminal olefins with succinimidyl diazoacetate. This catalytic system can perform under mild conditions, and the desired cyclopropane products are obtained in high yields with excellent diastereoselectivity and enantioselectivity.