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.
Acid Decomposition of 5-Amino-1-vinyl-4,5-dihydro-1<i>H</i>-1,2,3-triazoles. A Novel Formation of 1-Amino-2-azabutadienes
作者:Masato M. Ito、Yujiro Nomura、Yoshito Takeuchi、Shuji Tomoda
DOI:10.1246/bcsj.56.641
日期:1983.2
Acid decomposition of 4-alkyl-5-dialkylamino-1-vinyl-4,5-dihydro-1H-1,2,3-triazoles gave N1,N1-dialkyl-N2-vinylalkanamidines, which have 2-aza-1,3-butadiene skelton, in fair yields.