A Highly Chemoselective Oxidation of Alcohols to Carbonyl Products with Iodosobenzene Diacetate Mediated by Chromium(III)(salen) Complexes: Synthetic and Mechanistic Aspects
摘要:
The catalytic oxidation of the allylic alcohols 1d-n with iodosobenzene diacetate, mediated by the [Cr-III(salen)]X complex, affords the respective enones in excellent chemoselectivity for Cl- as counterion [complex A(Cl)], while for the counterions TfO- [complex A(TfO)] and PF6- [complex A(PF6)] nearly equal amounts of enone and epoxide are observed. This counterion-dependent oxidation of allylic alcohols by Cr-III(salen) complexes is rationalized in terms of Lewis acid catalysis by the complex A(CI) and redox catalysis for A(TfO) and A(PF6).
CYCLIC ETHER PYRAZOL-4-YL-HETEROCYCLYL-CARBOXAMIDE COMPOUNDS AND METHODS OF USE
申请人:Genentech, Inc.
公开号:US20140088117A1
公开(公告)日:2014-03-27
Cyclic ether pyrazol-4-yl-heterocyclyl-carboxamide compounds of Formula I, including stereoisomers, geometric isomers, tautomers, and pharmaceutically acceptable salts thereof, wherein R
2
is a cyclic ether and X is thiazolyl, pyrazinyl, pyridinyl, or pyrimidinyl, are useful for inhibiting Pim kinase, and for treating disorders such as cancer mediated by Pim kinase. Methods of using compounds of Formula I for in vitro, in situ, and in vivo diagnosis, prevention or treatment of such disorders in mammalian cells, or associated pathological conditions, are disclosed.
Highly Enantioselective Iridium-Catalyzed Hydrogenation of Conjugated Trisubstituted Enones
作者:Bram B. C. Peters、Jira Jongcharoenkamol、Suppachai Krajangsri、Pher G. Andersson
DOI:10.1021/acs.orglett.0c04012
日期:2021.1.1
Asymmetric hydrogenation of conjugated enones is one of the most efficient and straightforward methods to prepare optically active ketones. In this study, chiral bidentate Ir–N,P complexes were utilized to access these scaffolds for ketones bearing the stereogenic center at both the α- and β-positions. Excellent enantiomeric excesses, of up to 99%, were obtained, accompanied with good to high isolated
A simple, tandem approach to the construction of pyridine derivatives under metal-free conditions: a one-step synthesis of the monoterpene natural product, (−)-actinidine
followed by concomitant cyclization through an allenylintermediate to afford pyridines in excellent yields, with water as the sole by-product. This mild strategy is also suitable for functionalization of natural products or other advanced intermediates having α,β-unsaturated carbonyl functionality. The utility of the present protocol was showcased with the synthesis of the monoterpene alkaloid, (−)-actinidine
NOVEL METHODS FOR PREPARATION OF SUBSTITUTED PYRIDINES AND RELATED NOVEL COMPOUNDS
申请人:Watkins Edmond Blake
公开号:US20200095245A1
公开(公告)日:2020-03-26
The present invention relates to novel methods of preparation of substituted pyridines and the compounds produced therefrom. In particular, the present invention provides efficient methods for the construction of diversely substituted pyridines, with varying substitution patterns under simple and metal-free conditions with high atom- and pot-economy and excellent functional group tolerance, and which are useful for the synthesis of natural products.
[EN] OXEPAN-2-YL-PYRAZOL-4-YL-HETEROCYCLYL-CARBOXAMIDE COMPOUNDS AND METHODS OF USE<br/>[FR] COMPOSÉS OXÉPAN-2-YL-PYRAZOL-4-YL-HÉTÉROCYCLYLE-CARBOXAMIDE ET LEURS MÉTHODES D'UTILISATION
申请人:HOFFMANN LA ROCHE
公开号:WO2015140189A1
公开(公告)日:2015-09-24
Oxepan-2-yl pyrazol-4-yl-heterocyclyl-carboxamide compounds of Formula I, including stereoisomers, geometric isomers, tautomers, and pharmaceutically acceptable salts thereof, wherein X is thiazolyl, pyrazinyl, pyridinyl, or pyrimidinyl, are useful for inhibiting Pim kinase, and for treating disorders such as cancer mediated by Pim kinase. Methods of using compounds of Formula I for in vitro, in situ, and in vivo diagnosis, prevention or treatment of such disorders in mammalian cells, or associated pathological conditions, are disclosed.