Convenient access to isoindolinones via carbamoyl radical cyclization. Synthesis of cichorine and 4-hydroxyisoindolin-1-one natural products
摘要:
An efficient and convenient access to 2-tert-butylisoindolin-1-ones via an oxidative radical cyclization process from stable carbamoylxanthates, derived from secondary tert-butylamines, is described. The proposed mechanism for this transformation involves, the generation of a carbamoyl radical, its cyclization to the aromatic system, and the dilauroyl peroxide (DLP) mediated rearomatization to generate the isoindolinone ring system. Additionally, the syntheses of cichorine and 4-hydroxyisoindolin-1-one natural products were carried out to underscore the synthetic potential of this xanthate-based carbamoyl radical-oxidative cyclization. (C) 2011 Elsevier Ltd. All rights reserved.
Direct and indirect reductive amination of aldehydes and ketones with solid acid-activated sodium borohydride under solvent-free conditions
作者:Byung Tae Cho、Sang Kyu Kang
DOI:10.1016/j.tet.2005.04.039
日期:2005.6
A simple and convenient procedure for reductive amination of aldehydes and ketonesusingsodiumborohydride activated by boric acid, p-toluenesulfonic acid monohydrate or benzoic acid as reducing agent under solvent-free conditions is described.
Clean and Simple Chemoselective Reduction of Imines to Amines Using Boric Acid-Activated Sodium Borohydride under Solvent-Free Conditions
作者:Byung Tae Cho、Sang Kyu Kang
DOI:10.1055/s-2004-829066
日期:——
The first clean and highly effective solvent-free chemoselective reduction of functionalized aldimines and ketimines bearing easily reducible functional groups, such as ke- tone, carboxylic acid, ester, nitrile, amide, nitro, furyl and alkenyl groups, to the corresponding amines using boric acid-activated sodiumborohydride is described.
Carbamoyl radicals from carbamoylxanthates: a facile entry into isoindolin-1-ones
作者:Germán López-Valdez、Simón Olguín-Uribe、Luis D. Miranda
DOI:10.1016/j.tetlet.2007.09.142
日期:2007.11
It has been found that carbamoylxanthates derived from secondary t-butyl amines are stable compounds which function as efiicient sources of carbamoyl radicals. The carbamoylxanthates derived from t-butylbenzylamines can be efficiently transformed into 2- t-butylisoindolin-1-ones via an oxidative radical cyclization process. The carbamoylxanthates derived from N-t-butylamino olefins underwent the expected cyclization/xanthate-transfer process to afford the corresponding pyrrolidones and piperidones under thermally induced DLP fragmentation conditions and in the presence of catalytic Et3B in air, at room temperature. (C) 2007 Elsevier Ltd. All rights reserved.
NOVEL CYCLOSPORIN DERIVATIVES AND USES THEREOF
申请人:S&T Global Inc.
公开号:US20190151403A1
公开(公告)日:2019-05-23
A compound of the Formula (I) is disclosed: (I) or pharmaceutically acceptable salt thereof, wherein the symbols are as defined in the specification. Also described are a pharmaceutical composition comprising the same and a method for treating or preventing viral infections, inflammation, dry eye, central nervous disorders, cardiovascular diseases, cancer, obesity, diabetes, muscular dystrophy, lung, and liver, and kindey diseases, and hair loss using the same.
Convenient access to isoindolinones via carbamoyl radical cyclization. Synthesis of cichorine and 4-hydroxyisoindolin-1-one natural products
作者:Germán López-Valdez、Simón Olguín-Uribe、Alejandra Millan-Ortíz、Rocio Gamez-Montaño、Luis D. Miranda
DOI:10.1016/j.tet.2011.01.003
日期:2011.4
An efficient and convenient access to 2-tert-butylisoindolin-1-ones via an oxidative radical cyclization process from stable carbamoylxanthates, derived from secondary tert-butylamines, is described. The proposed mechanism for this transformation involves, the generation of a carbamoyl radical, its cyclization to the aromatic system, and the dilauroyl peroxide (DLP) mediated rearomatization to generate the isoindolinone ring system. Additionally, the syntheses of cichorine and 4-hydroxyisoindolin-1-one natural products were carried out to underscore the synthetic potential of this xanthate-based carbamoyl radical-oxidative cyclization. (C) 2011 Elsevier Ltd. All rights reserved.