Supported osmates, process for preparation thereof, and a process for the preparation of chiral vicinal diols using supported osmate catalyst
申请人:——
公开号:US20030105367A1
公开(公告)日:2003-06-05
The present invention provides a supported osmate useful as a reusable catalyst in the preparation of vicinal diols. The present invention also relates to a process for the preparation of supported osmates of the formula (S—NR
3
)
2
OsO
4
.nH
2
O wherein S is a support, R is an alkyl group, n is the number of water molecules and use thereof in the preparation of vicinal diols by asymmetric dihydroxylation (AD) of olefins in presence of cinchona alkaloid compounds.
[EN] CATIONIC TRANSITION-METAL ARENE CATALYSTS<br/>[FR] CATALYSEURS ARÈNE-MÉTAL DE TRANSITION CATIONIQUES
申请人:KANATA CHEMICAL TECHNOLOGIES I
公开号:WO2009132443A1
公开(公告)日:2009-11-05
Disclosed are cationic ruthenium arene complexes of Formula (I): [Ru(D-Z1-NHR1)(Ar)(LB)n]r+[Y-]r wherein Ar is optionally substituted aryl, D-Z1-NHR1 is a coordinated bidentate ligand wherein D, Z1, R1 and R2 are as defined herein, and where R1 and Ar, or R2 and Ar may be linked together, n is 0 or 1, r is 1 or 2, LB is a neutral Lewis base, and Y is a non-coordinating anion. The complexes are active catalysts for reduction reactions, including the transfer-hydrogenation of carbon-oxygen (C=O) and carbon-nitrogen (C=N) double bonds.
Multifunctional catalyst useful in the synthesis of chiral vicinal diols and process for the preparation thereof, and process for the preparation of chiral vicinal diols using said multifunctional catalysts
申请人:——
公开号:US20030176746A1
公开(公告)日:2003-09-18
The present invention relates to a multifunctional reusable catalyst and to a process for the preparation thereof on a single matrix of the support to perform multicomponent reaction in a single pot. The multifunctional catalysts of the invention are useful for the synthesis of chiral vicinal diols by tandem and/or simultaneous reactions involving Heck coupling, N-oxidation and AD reaction of olefins in presence of cinchona alkaloid compounds both as an native one and immobilized one in the said matrix support. This invention also relates to a process for preparing vicinal diols by asymmetric dihydroxylation of olefins in presence of cinchona alkaloid compounds employing reusable multifunctional catalysts as heterogeneous catalysts in place of soluble osmium catalysts.
Multifunctional catalyst useful in the synthesis of chiral vicinal diols and process for the preparation thereof
申请人:Council of Scientific and
Industrial Research
公开号:EP1346767A1
公开(公告)日:2003-09-24
The present invention relates to a multifunctional reusable catalyst and to a process for the preparation thereof on a single matrix of the support to perform multicomponent reaction in a single pot. The multifunctional catalysts of the invention are useful for the synthesis of chiral vicinal diols by tandem and / or simultaneous reactions involving Heck coupling, N-oxidation and AD reaction of olefins in presence of cinchona alkaloid compounds both as an native one and immobilized one in the said matrix support. This invention also relates to a process for preparing vicinal diols by asymmetric dihydroxylation of olefins in presence of cinchona alkaloid compounds employing reusable multifunctional catalysts as heterogeneous catalysts in place of soluble osmium catalysts.
本发明涉及一种多功能可重复使用的催化剂,以及一种在单一支撑基质上制备该催化剂的方法,用于在单一锅中执行多组分反应。本发明的多功能催化剂可用于在金鸡纳生物碱化合物的存在下,通过串联和/或同时反应合成手性邻二醇,涉及 Heck 偶联、N-氧化和烯烃的 AD 反应。该催化剂可以作为原生态和固定化的形式存在于所述支撑基质中。本发明还涉及一种通过在金鸡纳生物碱化合物的存在下,利用可重复使用的多功能催化剂作为异质催化剂来代替可溶性的钌催化剂,合成邻二醇的方法。
Enantioselective Pinacol Coupling of Aryl Aldehydes Catalyzed by Chiral Salan−Mo(IV) Complexes
作者:Hongwei Yang、Hongsong Wang、Chengjian Zhu
DOI:10.1021/jo701842r
日期:2007.12.1
Reported herein is the asymmetricpinacolcoupling of aromatic aldehydes with chiral Salan−Mo(VI) dioxo complex as an effective precatalyst. Chiral diols were obtained with high diastereoselectivity and enantioselectivity up to 92/8 and 95%, respectively. The possible mechanism of the pinacolcoupling reaction with the catalytic system was investigated. The X-ray crystal structure of the precatalyst