One-pot synthesis of 2,1-benzisoxazoles (anthranils) by a stannous chloride-mediated tandem reduction–heterocyclization of 2-nitroacylbenzenes under neutral conditions
摘要:
Classically, 2,1-benzisoxazoles (anthranils) are prepared from 2-nitroacylbenzenes by a reductive heterocyclization reaction with Sn or SnCl2 concentrated HCl. Acid sensitive functionalities are expected to be incompatible with these conditions; milder approaches to the synthesis of 2,1-benzisoxazoles would be welcomed. We demonstrate that SnCl2 center dot 2H(2)O in a 1:1 mixture of EtOAc/MeOH is capable of mediating the tandem reduction-heterocyclization of a variety of 2-nitroacylbenzenes to their corresponding 2,1-benzisoxazoles in good to excellent yields under essentially neutral conditions. Importantly, several commonly used acid-labile protecting groups, including Boc carbamate, tert-butyl ether, and tert-butyl ester, proved orthogonal to these reaction conditions. (C) 2012 Elsevier Ltd. All rights reserved.
[EN] TRI- AND TETRACYCLIC PYRAZOLO[3,4-B]PYRIDINE COMPOUNDS AS ANTINEOPLASTIC AGENT [FR] COMPOSÉS TRICYCLIQUES ET TÉTRACYCLIQUES DE PYRAZOLO[3,4-B]PYRIDINE EN TANT QU'AGENT ANTINÉOPLASIQUE
Heterocyclic compounds as Wee1 inhibitors are provided. The compounds may find use as therapeutic agents for the treatment of diseases and may find particular use in oncology.
TRI - AND TETRACYCLIC PYRAZOLO[3,4-B]PYRIDINE COMPOUNDS AS ANTINEOPLASTIC AGENT
申请人:Rabot Rémi
公开号:US20140031362A1
公开(公告)日:2014-01-30
The present invention relates to compounds of following general formula (I): and to the pharmaceutically acceptable salts of same, the tautomers of same, the stereoisomers or mixture of stereoisomers in any proportions of same, such as a mixture of enantiomers, notably a racemic mixture, as well as to methods for preparing same and uses of same, notably as an antineoplastic agent.
Tri- and tetracyclic pyrazolo[3,4-B]pyridine compounds as antineoplastic agent
申请人:Rabot Rémi
公开号:US09085575B2
公开(公告)日:2015-07-21
The present invention relates to compounds of following general formula (I): and to the pharmaceutically acceptable salts of same, the tautomers of same, the stereoisomers or mixture of stereoisomers in any proportions of same, such as a mixture of enantiomers, notably a racemic mixture, as well as to methods for preparing same and uses of same, notably as an antineoplastic agent.
Heterocyclic compounds of Formula (I):
as Wee1 inhibitors are provided. The compounds may find use as therapeutic agents for the treatment of diseases and may find particular use in oncology.