Radical Migration–Addition of N-tert-Butanesulfinyl Imines with Organozinc Reagents
摘要:
A novel migration-addition sequence was discovered for the reaction of enantioenriched N-tert-butanesulfinyl with iminoacetate la functionalized benzylzinc bromide reagents, producing tert-leucine derivatives in excellent diastereoselectivity (dr 98:2). The absolute configurations of two new chiral centers were unambiguously assigned by chemical transformations and X-ray crystallography. In addition, the regio- and diastereoselectivities of this novel reaction were both explained through the key N-sulfinamine intermediate M6 generated by the tert-butyl radical attack on the imine. Computational analysis of this reaction process, which was performed at the B3LYP/6-311++G(3df,2p)//B3LYP/6-31G*-LANL2DZ level, also supported our proposed two-stage mechanism.
[EN] BETA-LACTAMASE INHIBITOR COMPOUNDS<br/>[FR] COMPOSÉS INHIBITEURS DE BÊTA-LACTAMASE
申请人:ENTASIS THERAPEUTICS LTD
公开号:WO2018053215A1
公开(公告)日:2018-03-22
The present invention is directed to compounds which are beta-lactamase inhibitors. The compounds and their pharmaceutically acceptable salts are useful in combination with beta- lactam antibiotics, for the treatment of bacterial infections, including infections caused by drug resistant organisms, including multi-drug resistant organisms. The present invention includes compounds according to Formula (I): or a pharmaceutically acceptable salt thereof, wherein the values of R1, R2, R3, R4, R5 and R6 are described herein.
Synthesis of 3-Indolylglycine Derivatives via Dinuclear Zinc Catalytic Asymmetric Friedel–Crafts Alkylation Reaction
作者:Xin-Wei Wang、Yuan-Zhao Hua、Min-Can Wang
DOI:10.1021/acs.joc.6b01805
日期:2016.10.7
A direct asymmetric Friedel–Crafts (F–C) alkylation reaction between a wide range of indoles and ethyl 2-(4-methoxyphenylimino)acetate catalyzed by Trost’s dinuclear complex is reported. A series of 3-indolylglycine derivatives were synthesized in enantioselectivity of up to >99% enantiomeric excess (ee) using 10 mol% catalyst loading under mild conditions. This atom economic reaction could be run
Indium-mediated diastereoselective allylation of N-tert-butanesulfinyl imines derived from α-ketoesters
作者:Edgar Maciá、Francisco Foubelo、Miguel Yus
DOI:10.1016/j.tet.2016.07.020
日期:2016.10
α-aldimino and -ketimino esters 3 with allylic bromides proceeds with high diastereoselectivity to yield homoallylic α-amino ester derivatives 5, in both THF and water as solvents. The reactions are diastereospecific, the stereochemical outcome depending on the configuration of both the sulfur atom of the sulfinyl group and the CN double bond. Of particular interest are the reaction products using ethyl
[EN] METHOD FOR SYNTHESIS OF DIAZABICYCLO[6.2.0]DECANE RELATED COMPOUNDS<br/>[FR] PROCÉDÉ DE SYNTHÈSE DE COMPOSÉS APPARENTÉS AU DIAZABICYCLO[6.2.0] DÉCANE
申请人:EISAI R&D MAN CO LTD
公开号:WO2020146568A1
公开(公告)日:2020-07-16
A method for the synthesis of diazabicyclo[6.2.0]decane compounds is provided. The synthesis proceeds by stereoselective synthesis of a chiral lactone followed by azetidine formation via a series of chemoselective reactions. Bicyclization results with the formation of diazobicyclo[6.2.0]decane related compounds.