Reactions of 1,3-diaza-1,3-butadienes with haloketenes - rearrangements accompanying [4+2] cycloaddition reactions.
作者:Sujit N. Mazumdar、Sucharita Mukherjee、Arun K. Sharma、Devashish Sengupta、Mohinder P. Mahajan
DOI:10.1016/s0040-4020(01)90485-5
日期:——
1-Aryl-2-phenyl-4-thioalkyl-4-secondaryamino-1,3-diaza-1, 3-butadienes 8 yielded interesting pyrimidones 10, 22 and 7 with chloroketenes 2, 11 and 12 through their episulfonium intermediates, whereas 1-aryl-2-phenyl-(methylthio) -4-dimethylamino-1,3-diaza-1,3-butadienes 1 give different pyrimidones with different haloketenes (chloro, bromo and iodo).
Unusual methylene transfer in reactions of Simmons–Smith reagent with 1,3-diazabuta-1,3-dienes: synthesis of functionalised imidazole derivatives
作者:S Jayakumar、Mohinder P Mahajan
DOI:10.1016/s0040-4020(02)00127-8
日期:2002.4
The reactions of Simmons–Smithreagent with 1-aryl-2-phenyl-4-methylthio-4-secondary amino 1,3-diazabuta-1,3-dienes 1 underwent an unusual 1,4-methylene transfer resulting in the formation of 1-aryl-2-phenyl-4-secondary amino imidazoles 4. Whereas, its reactions with 1-aryl-2-phenyl-4-secondary amino-1,3-diazabuta-1,3-dienes 8 underwent an initial 1,2-methylene transfer leading to an aziridine intermediate
1,4-Addition of reformatsky reagent to 1,3-diaza-1,3-butadienes
作者:Sujit N. Mazumdar、Mohinder P. Mahejan
DOI:10.1016/s0040-4039(00)97585-3
日期:1990.1
The 1,4-conjugated addition of the Reformatskyreagent from ethyl bromoacetate to 1-aryl-4-methylthio-4-sec.amino-2-phenyl-1, 3-dieza-1,3-butadienes gives 1-aryl-2-phenyl-4-sec.amino-1,6-dihydropyrimidin-6-ones.
Unusual 1,4-methylene transfer from a Simmons-Smith reagent to 1,3-diazabuta-1,3-dienes
作者:S. Jayakumar、M.P.S. Ishar、Mohinder P. Mahajan
DOI:10.1016/s0040-4039(98)01365-3
日期:1998.9
Novel 1,4 methylene transfer from a Simmons-Smithreagent to 1-aryl-4-secondary amino-4-methylthio or methyl-2-phenyl-1,3-diazabuta-1,3-dienes leading to 1-aryl-2-phenyl-4-secondary amino or methyl -imidazoles are described.