Strategies for the Generation of Molecularly Imprinted Polymeric Nitroxide Catalysts
摘要:
[GRAPHICS]Two strategies for preparing catalytically active molecularly imprinted nitroxide-containing polymers are outlined. Both strategies rely upon the thermal rearrangement chemistry of tertiary amine N-oxides. To this end, several polymers were prepared and the polymeric nitroxides were revealed by oxidation with m-CPBA. All of the resulting polymeric catalysts proved to be competent mediators of the oxidation of alcohols.
Chemoselective Rearrangement Reactions of Sulfur Ylide Derived from Diazoquinones and Allyl/Propargyl Sulfides
作者:Sijia Yan、Junxin Rao、Cong-Ying Zhou
DOI:10.1021/acs.orglett.0c03493
日期:2020.11.20
three types of rearrangement reactions of sulfur ylidederivedfrom diazoquinones and allyl/propargyl sulfides. With Rh2(esp)2 as the catalyst, diazoquinones react with allyl/propargyl sulfides to form a sulfur ylide, which undergoes a chemoselective tautomerization/[2,3]-sigmatropic rearrangement reaction, a Doyle–Kirmse rearrangement/Cope rearrangement cascade reaction, or a Doyle–Kirmse rearrangement/elimination
(π-allyl)Ni complex, which readily cyclises in a “metallo-ene”-type reaction. The different pathways were characterised by further carbonylinsertion or by protonolysis, resulting either in cyclopentanone formation (insertion followed by β-elimination) when under carbonmonoxide gas, or in single cyclization when not (or, even better, when in the presence of protic acids). Coordination of the distal olefin
[EN] TUBULYSIN ANALOGS AND METHODS<br/>[FR] ANALOGUES DE TUBULYSINE ET PROCÉDÉS ASSOCIÉS
申请人:ENDOCYTE INC
公开号:WO2017031209A1
公开(公告)日:2017-02-23
The present disclosure relates to tubulysin derivatives and methods for making the same. The disclosure also relates to the use of such tubulysin derivatives in the preparation of drug conjugates of tubulysins.
Radical Aza-Cyclization of α-Imino-oxy Acids for Synthesis of Alkene-Containing <i>N</i>-Heterocycles via Dual Cobaloxime and Photoredox Catalysis
作者:Jia-Lin Tu、Jia-Li Liu、Wan Tang、Ma Su、Feng Liu
DOI:10.1021/acs.orglett.0c00224
日期:2020.2.7
Nitrogen-containing heterocycles are prevalent in both naturally and synthetically bioactive molecules. We report herein an unprecedented protocol for radical aza-cyclization of α-imino-oxy acids with pendant alkenes via synergistic photoredox and cobaloxime catalysis. With or without alkenes as the intermolecular cross-coupling partners, the transformation provides a variety of corresponding alkene-containing dihydropyrrole
CuH-Catalyzed Regioselective Intramolecular Hydroamination for the Synthesis of Alkyl-Substituted Chiral Aziridines
作者:Haoxuan Wang、Jeffrey C. Yang、Stephen L. Buchwald
DOI:10.1021/jacs.7b04816
日期:2017.6.28
This report details a general and enantioselective means for the synthesis of alkyl-substituted aziridines. This protocol offers a direct route for the synthesis of alkyl-substituted chiral aziridines from achiral starting materials. Readily accessed allylic hydroxylamine esters undergo copper hydride-catalyzed intramolecular hydroamination with a high degree of regio- and enantiocontrol to afford