One-Pot Selective Synthesis of Multisubstituted Quinoxalin-2(1H)-ones by a Ugi 4CR/Catalytic Aza-Wittig Sequence
作者:Yan-Mei Yan、Ming-Wu Ding、Hao-Yang Li、Jing Ren、Song Wang
DOI:10.1055/s-0037-1609846
日期:2018.7
A facile, one-pot synthesis of multisubstituted quinoxalin-2(1H)-ones via a Ugi 4CR/catalytic aza-Wittigsequence has been developed. In the presence of a catalytic amount of 3-methyl-1-phenyl-2-phospholene 1-oxide, the reaction of 2-aminobenzoyl azides, aldehydes, ketoacids, and isocyanides selectively produces quinoxalin-2(1H)-ones as the sole products in high yields.
已经开发出一种通过 Ugi 4CR/催化 aza-Wittig 序列轻松、一锅合成多取代喹喔啉-2(1H)-ones 的方法。在催化量的 3-甲基-1-苯基-2-磷烯 1-氧化物存在下,2-氨基苯甲酰叠氮化物、醛、酮酸和异氰化物的反应选择性地产生喹喔啉-2(1H)-酮作为唯一的产品产量高。
Oxidovanadium(<scp>v</scp>) complexes of aroylhydrazones incorporating heterocycles: synthesis, characterization and study of DNA binding, photo-induced DNA cleavage and cytotoxic activities
作者:Subhashree P. Dash、Alok K. Panda、Sagarika Pasayat、Rupam Dinda、Ashis Biswas、Edward R. T. Tiekink、Subhadip Mukhopadhyay、Sujit K. Bhutia、Werner Kaminsky、Ekkehard Sinn
DOI:10.1039/c4ra14369h
日期:——
and 2, based on a tridentate-O,N,N coordinating anion and two oxido-O atoms. The dianion in 3 is tetradentate, coordinating one V atom as for 1 and 2, and bridging another via the pyridyl-N atom, and the N2O4 octahedral coordination geometry is completed by oxido- and ethanolate-O atoms. The result of the V–N bridging is a helical coordination polymer. An NO5 octahedral geometry is found in 4 defined
四种中性氧化钒(V)络合物VO 2 L 1(1),VO 2 L 2(2),VOL 3(OEt)(3)和VOL 4(OEt)EtOH(4)[其中HL 1 = 2-噻吩yl 2-乙酰基吡啶,HL 2 = 2-苯甲酰基吡啶的2-氨基苯甲yl,H 2 L 3 = 2-羟基苯乙酮的异烟酰yl ,H 2 L 4合成具有with呋喃,噻吩和吡啶残基的支架。所有配合物均通过各种光谱(红外,紫外-可见,NMR和ESI-MS)和单晶X射线衍射技术进行了全面表征。晶体学基于三齿-O,N,N配位阴离子和两个氧-O原子,建立了五坐标的几何形状,对于1和2中的每一个,其几何形状都向方形锥体变形。3中的二价阴离子为四齿状,与1和2配位一个V原子,并通过吡啶基-N原子与N 2 O 4桥接另一个八面体的配位几何结构由O和O原子完成。V–N桥接的结果是螺旋配位聚合物。一个NO 5八面体几何形状中发现的4由三齿-O定义,N,O
One-Pot Synthesis of Multisubstituted Benzimidazoles via Sequential Ugi and Catalytic Aza-Wittig Reaction Starting from 2-Aminobenzoyl Azides
作者:Yan-Mei Yan、Yong Rao、Ming-Wu Ding
DOI:10.1021/acs.joc.5b02575
日期:2016.2.5
A simple and one-pot synthesis of multisubstituted benzimidazoles by a Ugi 4CC/catalytic aza-Wittig sequence was developed. The reaction of 2-aminobenzoyl azide 2, aldehyde 3, acid 4, and isocyanide 5 produced the benzimidazoles 8 in moderate to good yields via a sequential Ugi condensation and catalytic aza-Wittig in the presence of a catalytic amount of phospholene oxide.