Kinetic resolution of racemic epoxides using a chiral diamine catalyst
摘要:
The kinetic resolution of a variety of racemic epoxides has been performed using a chiral bicyclic diamine ligand. Using 5 mol% of catalyst very high selectivity could be achieved; both epoxide and the corresponding allylic alcohol could be obtained in up to 99% ee. (c) 2005 Elsevier Ltd. All rights reserved.
carbodiimides in hydroxylic solvents containing hydrogenperoxide with mildly basic or acidic catalysts have been found to promote the epoxidation of olefins. A commercially available 30% aqueous solution of hydrogenperoxide serves as the oxidant for this process. The presumed reactive species is a peroxyisourea generated in situ by the addition of hydrogenperoxide to the carbodiimide.
Syn regioselectivity of the hydroperoxidation of cyclo-alkenes with singlet oxygen
作者:Charles W. Jefford、Christian G. Rimbault
DOI:10.1016/0040-4039(81)80156-6
日期:1981.1
The regioselectivity of hydroperoxidation of 1-alkylcycloalkenes is rationalized in terms of the formation of a zwitterionic peroxide.
根据两性离子过氧化物的形成,合理化1-烷基环烯烃的氢过氧化的区域选择性。
US6130217A
申请人:——
公开号:US6130217A
公开(公告)日:2000-10-10
Compounds enhancing antitumor activity of other cytotoxic agents
申请人:Pfizer Inc
公开号:US06130217A1
公开(公告)日:2000-10-10
This invention relates to certain heterocyclic compounds and their pharmaceutically acceptable salts, which are useful for sensitizing multidrug-resistant tumor cells to anticancer agents and multidrug resistant forms of malaria, tuberculosis, leishmania and amoebic dysentery to chemotherapeutants. The compounds and their pharmaceutically acceptable salts are also inhibitors of the active drug transport capability of P-glycoprotein which is encoded by the human MDR1 gene, as well as of certain other related ATP-binding-cassette transporters from eukaryotic and prokaryotic organisms (e.g., pfmdr from Plasmodium falciprum, and murine mdr1 and mdr3 gene products).
Kinetic resolution of racemic epoxides using a chiral diamine catalyst
作者:Arnaud Gayet、Pher G. Andersson
DOI:10.1016/j.tetlet.2005.05.017
日期:2005.7
The kinetic resolution of a variety of racemic epoxides has been performed using a chiral bicyclic diamine ligand. Using 5 mol% of catalyst very high selectivity could be achieved; both epoxide and the corresponding allylic alcohol could be obtained in up to 99% ee. (c) 2005 Elsevier Ltd. All rights reserved.