title: The [3 + 2] cycloaddition reaction of thiazole carbene-derived C-C-Se 1,3-dipoles: a concise and highly efficient strategy for the construction of multifunctional dihydroselenophenes and selenopheno[2,3-b]pyrazines.
abstract: The first study on the reaction of C(+)-C-Se(-) 1,3-dipoles with electron-deficient alkenes and alkyne is reported. 2-Arylselenocarbamoylthiazolium inner salts, the unique thiazole carbene-derived C(+)-C-Se(-) 1,3-dipoles, reacted efficiently with methoxycarbonylallenes or dimethyl acetylenedicarboxylate to produce dihydroselenophenes or selenopheno[2,3-b]pyrazines, respectively, in high yields. Both reactions probably proceeded via a [3 + 2] cycloaddition of C(+)-C-Se(-) 1,3-dipoles with alkenes or alkyne followed by different transformations of the thiazole-spiro-selenophene intermediates. This work provides a concise and efficient strategy for the construction of multifunctional dihydroselenophenes and selenopheno[2,3-b]pyrazines, which are not easy accessible by other methods.
authors.affiliation: College of Chemistry, Beijing Normal University, Beijing, 100875, China.
authors.forename: Jian-Hong
authors.initials: JH
authors.lastname: Zhang
authors.forename: Ying
authors.initials: Y
authors.lastname: Cheng
mesh_terms: D000475:Alkenes / Q000737:chemistry; D000480:Alkynes / Q000737:chemistry; D002384:Catalysis; D003500:Cyclization; D008697:Methane / Q000031:analogs & derivatives / Q000737:chemistry; D011719:Pyrazines / Q000138:chemical synthesis*; D013844:Thiazoles / Q000737:chemistry*
chemical_list: D000475:Alkenes; D000480:Alkynes; D011719:Pyrazines; D013844:Thiazoles; C030011:carbene; C022918:acetylenedicarboxylic acid dimethyl ester; D008697:Methane