Catalytic enantioselective allylic oxidation of olefins with copper(I) catalysts and new perester oxidants
摘要:
Asymmetric allylic oxidation of cyclic olefins using a catalytic amount of copper(I) bisoxazoline complexes and new peresters was investigated to give allylic benzoate esters in high selectivity (similar to 80%ee), yield (70-80%), and at reasonable rates (5-7 d) at -20 degrees C in acetonitrile. Cyclohexene reacted with pam-chloro tert-butylperbenzoate and 15 mol% diphenylbisoxazoline-copper(I) hexafluorophosphate to give benzoate product in 83% yield and 75% ee. (C) 1997 Elsevier Science Ltd.
Studies on enantioselective allylic oxidation of olefins using peresters catalyzed by Cu(i)-complexes of chiral pybox ligands
作者:Sandeep K. Ginotra、Vinod K. Singh
DOI:10.1039/b612423b
日期:——
Enantioselective allylic oxidation of olefins with various peresters, using a catalytic amount of Cu(I)-pybox complex, can be tuned to achieve high asymmetric induction (up to 98% ee) by choosing a unique combination of a ligand and a perester at room temperature. The asymmetric induction in the reaction strongly depends on the nature of the substituents attached to the aryl ring of peresters. The
Expedient synthesis of oseltamivir and related compounds via direct olefin diazidation-diamidation reaction
申请人:GEORGIA STATE UNIVERSITY RESEARCH FOUNDATION, INC.
公开号:US10385010B1
公开(公告)日:2019-08-20
Disclosed herein are improved methods for the preparation of oseltamivir, and intermediates useful thereto.
本文披露了改进的奥司他韦制备方法,以及与之有关的有用中间体。
Copper-catalyzed enantioselective allylic oxidation of acyclic olefins
作者:Bo Zhang、Shou-Fei Zhu、Qi-Lin Zhou
DOI:10.1016/j.tetlet.2013.03.046
日期:2013.5
copper-catalyzed asymmetricallylicoxidation of acyclic olefins has been developed. By using the complexes of copper and chiral spiro bisoxazoline ligands as catalysts, the oxidation of various acyclic olefins was accomplished with excellent regioselectivity (>20:1 in most cases) and up to 67% ee under mild reaction conditions, which represents one of the best results for the enantioselective allylic oxidation
Temperature-controlled solvent-free selective synthesis of tert-butyl peresters or acids from benzyl cyanides in the presence of the TBHP/Cu(OAc)<sub>2</sub> system
作者:H. Hashemi、D. Saberi、S. Poorsadeghi、Kh. Niknam
DOI:10.1039/c6ra27921j
日期:——
tert-butyl peresters was achieved via copper-catalyzed oxidative-coupling of benzyl cyanides with tert-butyl hydroperoxide in short reaction times. Various derivatives of tert-butyl peresters were synthesized by this pathway in good to excellent yields. Further investigation revealed that the above-mentioned protocol is effective for the synthesis of benzoic acid derivatives when the reaction is conducted
Synthesis of tert-butyl peresters from aldehydes by Bu4NI-catalyzed metal-free oxidation and its combination with the Kharasch–Sosnovsky reaction
作者:Wei Wei、Chao Zhang、Yuan Xu、Xiaobing Wan
DOI:10.1039/c1cc14602e
日期:——
A new tert-butyl peresterssynthesis directly from aldehydes and TBHP was developed via Bu(4)NI-catalyzed aldehyde C-H oxidation. Mechanistic studies suggest that the protocol proceeds via a radical process. Combining the method with the Kharasch-Sosnovsky reaction offers a practical approach for the synthesis of allylic esters from simple aldehydes and alkenes via a two-step one-pot procedure.