RAJAPPA S.; SVEENVASAN R., TETRAHEDRON, 1980, 36, NO 20-21, 387-390
作者:RAJAPPA S.、 SVEENVASAN R.
DOI:——
日期:——
RAJAPPA S.; ADVANI B. G.; SREENIVASAN R., INDIAN J. CHEM., 1980, B19, NO 7, 536-538
作者:RAJAPPA S.、 ADVANI B. G.、 SREENIVASAN R.
DOI:——
日期:——
Rajappa, S.; Advani, B. G.; Sreenivasan, R., Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 1980, vol. 19, # 7, p. 536 - 538
作者:Rajappa, S.、Advani, B. G.、Sreenivasan, R.
DOI:——
日期:——
Intramolecular oxidative cyclization on orthophenylenediamines
作者:S. Rajappa、R. Sreenivasan
DOI:10.1016/0040-4020(80)88036-7
日期:1980.1
A novel intramolecularoxidativecyclization of the 3,4-diaminophenyl thiourea (3) to the 5,6-diaminobenzthiazole (4) is reported. This conversion can be brought about by Pd/C in presence of atmospheric oxygen in acid solution. It is likely that the quinone-imine (5) is an intermediate in this transformation. Surprisingly catalytic reduction (Pd/C, H2) of the 4-amino-3-nitrophenyl thiourea (2) gave