FORMATION OF UNUSUAL PYRROLES BY PHOTOLYSIS OF 1-VINYL-4,5-DIHYDRO-1<i>H</i>-1,2,3-TRIAZOLES
作者:Masato M. Ito、Yujiro Nomura、Yoshito Takeuchi、Shuji Tomoda
DOI:10.1246/cl.1981.1519
日期:1981.11.5
Photolysis of 4-alkyl-5-amino-1-vinyl-4,5-dihydro-1H-1,2,3-triazoles gave not 3-alkylpyrroles but unexpected 2-alkylpyrroles in 80–83 % yields. Similarly 4,4-dimethyltriazole derivatives gave 2,2-dimethyl-2H-pyrroles in 70–74 % yields. 1-Vinylaziridines were assumed as a possible intermediate of this anomalous reaction.
Photochemical Nitrogen Extrusion of 5-Amino-1-vinyl-4,5-dihydro-1<i>H</i>-1,2,3-triazoles. Formation of Unusual Pyrroles
作者:Masato M. Ito、Yujiro Nomura、Yoshito Takeuchi、Shuji Tomoda
DOI:10.1246/bcsj.56.533
日期:1983.2
Photolysis of 4-alkyl-5-ammo-1-vinyl-4,5-dihydro-1H-1,2,3-triazoles gave not 3-alkylpyrroles, but unexpected 2-alkylpyrroles in 80–83% yields. 1-Vinylaziridines were assumed as a possible intermediate of this unusual pyrrole formation. In the photolysis of 7a-morpholino-1-styryl-3a,4,5,6,7,7a-hexahydro-1H-1,2,3-benzotriazole, however, nitrogen extrusion did not occur, but trans-cis isomerization took
5-Amino-1-vinyl-4,5-dihydro-1<i>H</i>-1,2,3-triazoles as a Source of 1-Amino-2-aza-1,3-butadiene
作者:Yujiro Nomura、Yoshito Takeuchi、Shuji Tomoda、Masato M. Ito
DOI:10.1246/bcsj.54.2779
日期:1981.9
Thermolysis of 4,4-dimethyl-1-(1-phenylvinyl)-5-(1-pyrrolidinyl)-4,5-dihydro-1H-1,2,3-triazole gave 2-methyl-N-(1-phenylvinyl)-1-(l-pyrrolidinyl)-1-propanimine, which reacted as a 2-azabutadiene with electrondeficient dienophiles to afford the corresponding [4+2] cycloadducts. Reactivity and regioselectivity of the cycloaddition reactions were rationalized with the frontier molecular orbital treatment.