The invention concerns quinazoline derivatives of the formula I ##STR1## wherein X.sup.1 is a direct link or a group such as CO, C(R.sup.2).sub.2 and CH(OR.sup.2); wherein Q.sup.1 is phenyl, naphthyl or a 5- or 6-membered heteroaryl moiety and Q.sup.1 optionally bears up to 3 substituents; wherein m is 1 or 2 and each R.sup.1 may be a group such as hydrogen, halogeno and trifluoromethyl; and wherein Q.sup.2 may be phenyl or a 9- or 10-membered bicyclic heterocyclic moiety and Q.sup.2 optionally bears up to 3 substituents; or a pharmaceutically-acceptable salt thereof; processes for their preparation, pharmaceutical compositions containing them and the use of their receptor tyrosine kinase inhibitory properties in the treatment of proliferative disease such as cancer.
General Synthesis of Fully Substituted 4-Aminooxazoles from Amides and 1,4,2-Dioxazol-5-ones Based on Amide Activation and Umpolung Process
作者:Yunxiang Weng、Lin Min、Lidong Shan、Hongchen Li、Xinyan Wang、Yuefei Hu
DOI:10.1021/acs.joc.0c02015
日期:2021.1.1
A general and efficientsynthesis of fully substituted 4-aminodixazoles was developed based on the strategies of amide activation and umpolung reaction. In this method, 1,4,2-dioxazol-5-ones were introduced as a rare type of umpolung reagent bearing a nucleophilic N-atom that could be used well together with the activating agent Tf2O. Because 1,4,2-dioxazol-5-ones played triple roles as an umpolung
Catalytic reduction of organic carbonyls using metal catalysts
申请人:Massachusetts Institute of Technology
公开号:US05220020A1
公开(公告)日:1993-06-15
A process is provided whereby organic carbonyl substrates, including esters, lactones, ketones, amides and imides are reduced in a reaction with a silane reducing reagent and a catalyst. Exemplary catalysts include metal alkoxides and metal aryloxides.