作者:Peter A. Brownsort、R.Michael Paton、Alan G. Sutherland
DOI:10.1016/s0040-4039(00)89234-5
日期:1985.1
ortho-(Phenylpropioloxy)benzonitrile sulphide, generated in situ by thermal decarboxylation of the oxathiazolone (1), undergoes intramolecular 1,3-dipolar cycloaddition forming the chromenoisothiazole (4a); ortho-cinnamoylbenzonitrile sulphides also yield (4), together with nitrile, chromenoquinoline and amino-chromene by-products.
An efficient ultrasound promoted catalyst-free protocol for the synthesis of chromeno[4,3-b]quinolin-6-ones
作者:J VENKATA PRASAD、J SATYANARAYANA REDDY、N RAVI KUMAR、K ANAND SOLOMON、G GOPIKRISHNA
DOI:10.1007/s12039-011-0134-z
日期:2011.9
A convenient, catalyst-free protocol for the quantitative synthesis of fused chromeno[4,3-b]quinolin-6-ones has been developed by simple one-pot reaction of substituted anilines with 4-chloro-3-formylcoumarin using ultrasound irradiation. The protocol offers the advantages of mild reaction conditions, short reaction times and high yields.
Reaktionen an Heterocyclen mit 2-Acyl-2-propenon-Teilstruktur, 6. Mitt. Zur Synthese von 6-Oxo-6H-[1]benzopyrano[4,3-b]chinolinen
作者:Dieter Heber
DOI:10.1002/ardp.19873200705
日期:——
Die 4‐Chlor‐2‐oxo‐2H‐chromen‐3‐carboxaldehyde 1 und 2 reagieren mit den aromatischen Aminen 3 zu den 6‐Oxo‐6H‐[1]benzopyrano[4,3‐b]chinolinen 6 und 7, deren Struktur durch unabhängige Synthese ‐ Vilsmeier‐Reaktion der 4‐Phenylaminocumarine 12 ‐ gesichert wird.
Substrate‐Induced Synthesis of Coumarin‐Fused Quinolinones from Anilines, 4‐Hydroxycoumarins and DMSO under Air
作者:Xu Shi、Qingqing Zhang、Anan Wang、Tao‐Shan Jiang
DOI:10.1002/adsc.202200284
日期:2022.6.21
Substrate-induced synthesis of 6H-Chromeno[4,3-b]quinolin-6-ones has been developed directly from anilines, 4-hydroxycoumarins and DMSO under air without any catalysts and additives in one pot. This protocol highlights dual roles of 4-hydroxycoumarins which were not only used as reactants but also activated DMSO to provide one-carbon unit in the desired products.
6 H - Chromeno[4,3 - b ]quinolin-6-ones 的底物诱导合成直接由苯胺、4-羟基香豆素和 DMSO 在空气中开发,无需任何催化剂和添加剂。该协议强调了 4-羟基香豆素的双重作用,它们不仅用作反应物,而且还激活 DMSO 以在所需产品中提供单碳单元。