Conformationally restricted 3,4-diarylfuranones (2,3a,4,5-tetrahydronaphthofuranones) as selective cyclooxygenase-2 inhibitors
摘要:
A number of naphthofuranones were synthesized and tested for COX-1 and COX-2 inhibition. Few of them were identified as selective COX-2 inhibitors. Structure-activity relationship studies within the series are discussed. (C) 2003 Elsevier Science Ltd. All rights reserved.
A transition-metal-free multicomponent reaction towards constructing chiral 2<i>H</i>-1,4-benzoxazine scaffolds
作者:Lixiang Zhu、Xiaoyu Ren、Juan Du、Jia-Hong Wu、Jian-Ping Tan、Jixing Che、Jianke Pan、Tianli Wang
DOI:10.1039/d0gc02134b
日期:——
transition-metal-free multicomponent cascade reaction of readily available α-halogenated ketones, ortho-aminophenols, and aldehydes using a novel dipeptide-based phosphonium salt catalyst was developed for the efficient construction of various 2H-1,4-benzoxazine derivatives with excellent functional-group tolerance. The method represents an unprecedented approach for trapping active 1,5-bifunctional intermediates
本文中,开发了一种使用新型的基于二肽的phospho盐催化剂的易于获得的α-卤代酮,邻氨基酚和醛的无过渡金属的多组分级联反应,以有效地构建各种2 H -1,4-苯并恶嗪具有出色的官能团耐受性的衍生物。该方法代表了一种空前的方法,用于捕获具有α-卤代酮的活性1,5-双功能中间体,以访问具有两个非立体诱导中心且具有两个立体生成中心的生物学上重要的苯并恶嗪支架。
Highly Enantioselective Synthesis of Fused Tri‐ and Tetrasubstituted Aziridines: aza‐Darzens Reaction of Cyclic Imines with α‐Halogenated Ketones Catalyzed by Bifunctional Phosphonium Salt
作者:Jianke Pan、Jia‐Hong Wu、Hongkui Zhang、Xiaoyu Ren、Jian‐Ping Tan、Lixiang Zhu、Hong‐Su Zhang、Chunhui Jiang、Tianli Wang
DOI:10.1002/anie.201900613
日期:2019.5.27
The first enantioselective aza‐Darzens reaction of cyclic imines with α‐halogenated ketones was realized under mild reaction conditions by using amino‐acid‐derived bifunctional phosphonium salts as phase‐transfer promoters. A variety of structurally dense tri‐ and tetrasubstituted aziridine derivatives, containing benzofused heterocycles as well as spiro‐structures, were readily synthesized in high yields
Dipeptide-Based Phosphonium Salt Catalysis: Application to Enantioselective Synthesis of Fused Tri- and Tetrasubstituted Aziridines
作者:Jia-Hong Wu、Jianke Pan、Tianli Wang
DOI:10.1055/s-0039-1690192
日期:2019.12
salt catalysis. This article briefly discusses the recent development in asymmetricreactions (mainly including nucleophilic additions and cyclizations) promoted by chiral quaternary phosphonium salt catalysts. We expect that more catalyticasymmetricreactions will be developed on the basis of such new phase-transfer catalytic systems in the near future.