Preparation of New Nitrogen-Bridged Heterocycles. 28. First Syntheses of 1,3-Oxazino[6,5-<i>b</i>]indolizine Derivatives
作者:Akikazu Kakehi、Suketaka Ito、Tosio Sakurai、Kunio Urushido、Susumu Hatanaka、Kouji Sugiura
DOI:10.1246/bcsj.64.3296
日期:1991.11
The reactions of 2-[mercapto(methylthio)methylene]-2(3H)-indolizinones with alkyl isothiocyanates in the presence of potassium t-butoxide in N,N-dimethylformamide afforded new heterocycles, 3-alkyl-2H-1,3-oxazino[6,5-b]indolizine-2,4(3H)-dithione derivatives, in moderate yields. On the other hand, their reactions with phenyl isothiocyanate did not afford the corresponding 2H-1,3-oxazino[6,5-b]indolizine-2,4(3H)-dithiones, although the reaction of 2-[mercapto(methylthio)methylene]-1-methyl-2(3H)-indolizinone with phenyl isothiocyanate gave 10-methyl-3-phenyl-2-phenylimino-2,3-dihydro-4H-1,3-oxazino[6,5-b]indolizine-4-thione in a very low yield (10%). The structures of these 2H-1,3-oxazino[6,5-b]indolizine-2,4(3H)-dithiones and the 2-phenylimino analogue were determined by inspections of their physical and spectral data and by a single crystal X-ray analysis of one of these compounds.
在N,N-二甲基甲酰胺中,2-[巯基(甲硫基)亚甲基]-2(3H)-吲哚嗪酮与烷基异硫氰酸酯在叔丁醇钾存在下反应,以中等的产率得到了新的杂环化合物,即3-烷基-2H-1,3-恶嗪并[6,5-b]吲哚嗪-2,4(3H)-二硫酮衍生物。另一方面,它们与苯基异硫氰酸酯的反应并未得到相应的2H-1,3-恶嗪并[6,5-b]吲哚嗪-2,4(3H)-二硫酮,尽管2-[巯基(甲硫基)亚甲基]-1-甲基-2(3H)-吲哚嗪酮与苯基异硫氰酸酯反应生成了10-甲基-3-苯基-2-苯亚胺-2,3-二氢-4H-1,3-恶嗪并[6,5-b]吲哚嗪-4-硫酮,但产率极低(10%)。这些2H-1,3-恶嗪并[6,5-b]吲哚嗪-2,4(3H)-二硫酮及其2-苯亚胺类似物的结构通过其物理和光谱数据检测以及其中一种化合物的单晶X射线分析确定。