Pyrido[2,3-b][1,4]oxazin-2-ones are conveniently prepared in excellent yields by a one-pot annulation of N-substituted-2-chloroacetamides with 2-halo-3-hydroxypyridines with use of cesium carbonate in refluxing acetonitrile. The key transformation features a Smiles rearrangement of the initial O-alkylation product and subsequent cyclization.
Novelpyridazino[4,5-b][1,4]oxazine-3,5-diones were synthesized from N-[2-(3,4-dimethoxyphenyl)-ethyl]-2-chloroacetamide (or 2-chloropropanamide) and 1-alkyl-5-halo-4-hydroxypyridazin-6-ones in good yield.
由N- [2-(3,4-二甲氧基苯基)-乙基] -2-氯乙酰胺(或2-氯丙酰胺)合成新型哒嗪并[4,5- b ] [1,4]恶嗪-3,5-二酮。1-烷基-5-卤代-4-羟基哒嗪-6-酮具有良好的收率。
One‐Pot Synthesis of Pyridazino[1,4]oxazin‐3‐ones
作者:Chen Ma、Su‐Dong Cho、J. R. Falck、Dong‐Soo Shin
DOI:10.1081/scc-120030689
日期:2004.12.31
Pyridazino[1,4] oxazin-3-ones were conveniently prepared in a one-pot condensation of N-substituted 2-chloroacetamides with various 5-chloro-pyridazin-6-ones via rearrangement of a spiro-aminoketal intermediate.
Synthetic Studies on Isoquinoline Derivatives with Multidrug Resistance (MDR) Modulating Activity
作者:Chen Ma、Su-Dong Cho、J. R. Falck、Dong-Soo Shin
DOI:10.3987/com-03-9918
日期:——
Tetrahydropyridazino-1,4-oxazinoisoquinoline derivatives with multidrug resistance (MDR) modulating activity were designed and synthesized. A key step for cyclization of 1,4-oxazine ring was developed using K2CO3 and CH3CN in one-pot. Among prepared compounds, 2-(4-fluorobenzyl)-9,10-dimethoxy-12-methyl-6,7,11b,12-tetrahydropyridazino[4',5',5,6][1,4]oxazine[3,4,-a]isoquinolin-1(2H)-one (If) exhibited significant MDR reversing activity and low toxicity, which might be as potential MDR agent.
Synthesis of some azeto[2,1-<i>a</i>]isoquinolin-2-ones
作者:Su-Dong Cho、Sung-Kyu Kim、Yong-Jin Yoon
DOI:10.1002/jhet.5570350115
日期:1998.1
Someazeto[2,1-a]isoquinolin-2-ones were synthesized from 2-(3,4-dimethoxyphenyl)ethylamine in three steps in good yield.
由2-(3,4-二甲氧基苯基)乙胺分三步合成了一些[ 2,1- a ]异喹啉-2-氮杂[ 2,1- a ]异喹啉-2-酮。