Heterocyclization of functionalized heterocumulenes with C,N- and C,O-binucleophiles: IV. Reactions of 1-chloroalkylheterocumulenes and N-(1-chloroalkylidene)carbamates with 2-benzimidazolylacetonitriles and methyl 2-benzimidazolylacetates
作者:M. V. Vovk、P. S. Lebed?、V. V. Pirozhenko、I. F. Tsymbal
DOI:10.1007/s11178-005-0077-2
日期:2004.11
1-Chloroalkyl isocyanates and 1-chloroalkylcarbodiimides undergo regioselective cyclization with nitriles and esters of 2-benzimidazolylacetic acid to give derivatives of 1-oxo and 1-arylimino-1,2,3,5-tetrahydrobenzo[4,5]imidazo[1,2-c]pyrimidine respectively. The cyclocondensation of 1,1-dichloroalkyl isocyanates or N-(1-chloroalkylidene)carbamates with nitriles and esters of 2-benzimidazolylacetic acid afforded 1,5-dihydrobenzo[4,5]imidazo[1,2-c]pyrimidin-1-one derivatives.
1,1-Dichloro-2,2,2-trihaloethyl Isocyanates and N-(1-Chloro-2,2,2-trihaloethylidene)urethanes in the Synthesis of 4-Trihalomethyl-2H-1,3-benzoxazin-2-ones
作者:M. V. Vovk、A. V. Bol'but、P. S. Lebed'、V. I. Boiko
DOI:10.1023/b:cohc.0000023776.49961.0f
日期:2004.1
A NEW SYNTHETIC ACCESS TO 2-TRIHALOGENOMETHYL- 3,4-DIHYDROFURO[2,3-d]- PYRIMIDIN-4-ONES
作者:Mykhaylo V. Vovk、Andrij V. Bol’but、Viktor I. Dorokhov、Volodymyr V. Pyrozhenko
DOI:10.1081/scc-120015392
日期:2002.1.1
2-Amino-5-alkoxycarbonylfurans la-c react with 1-chloro-2,2,2-trihalogenoethyliden-O-methylurethanes 2a,b at room temperature to give N-(2-furyl)-N'-methoxycarbonyl-trihalo-genoacetamidines 3a-f which cyclize into 2-trihalogenomethyl-3,4-dihydrofuro[2,3-d]pyrimidin-4-ones 4a-f on boiling in toluene.
Heterocyclizations of Functionalized Heterocumulenes with C,N- and C,O-Dinucleophiles: II.* Reaction of 1-Chloro- and 1,1-Dichloroalkyl Isocyanates and 1-Chloroalkylidenecarbamates with 2-Bensothiazolylacetonitrile, 2-Benzothiazolylacetates, and Bis(2-benzothiazolyl)methane
作者:M. V. Vovk、P. S. Lebed'、V. A. Sukach、M. Yu. Kornilov
DOI:10.1023/b:rujo.0000019744.08100.85
日期:2003.12
1-Chloroalkyl isocyanates react with 2-R-methylbenzothiazoles [R = CN, C(O)OAlk, 2-benzothiazolyl] in the presence of triethylamine to give 4-R-2,3-dihydro-1H-pyrimido[6,1-b][1,3]benzothiazol-1-ones. The same reaction at elevated temperature in the absence of a base yields isomeric 4-R-2,3-dihydro-1H-pyrimido[6,1-b][1,3]benzothiazol-3-ones. 4-R-1H-pyrimido[6,1-b][1,3]benzothiazol-1-ones are formed in the reaction of 1,1-dichloroalkyl isocyanates or methyl 1-chloroalkylidenecarbamates with 2-benzothiazolylacetonitrile or bis(2-benzothiazolyl)methane.
Heterocyclization of Functionalized Heterocumulenes with C,N- and C,O-Binucleophiles. 1. Cyclocondensation of 1-Chloroalkylheterocumulenes and N-(1-Chloroalkylidene)urethanes with 2-Cyanomethylpyridine
作者:M. V. Vovk、P. S. Lebed、A. N. Chernega、V. V. Pirozhenko、V. I. Boiko、I. F. Tsymbal