Intramolecular addition reactions during heteroatom directed photoarylation
作者:James P. Dittami、H. Ramanathan、S. Breining
DOI:10.1016/s0040-4039(01)80616-x
日期:1989.1
The intramolecular addition reactions of phototransient species generated upon heteroatomdirectedphotoarylation were investigated. Novel temperature effects were observed for both the photocyclization and intramolecular addition reactions. Moreover, the addition products observed differ considerably from the (3 + 2) cycloadducts which were obtained upon intermolecular addition to the phototransient
DITTAMI, JAMES P.;RAMANATHAN, H.;BREINING, S., TETRAHEDRON LETT., 30,(1989) N, C. 795-798
作者:DITTAMI, JAMES P.、RAMANATHAN, H.、BREINING, S.
DOI:——
日期:——
Dittami, James P.; Nie, Xiao Yi, Synthetic Communications, 1990, vol. 20, # 4, p. 541 - 547
作者:Dittami, James P.、Nie, Xiao Yi
DOI:——
日期:——
Tandem photocyclization-intramolecular addition reactions of aryl vinyl sulfides. Observation of a novel [2 + 2] cycloaddition-allylic sulfide rearrangement
作者:James P. Dittami、Xiao Yi Nie、Hong Nie、H. Ramanathan、C. Buntel、S. Rigatti、Jon Bordner、Debra L. Decosta、Paul Williard
DOI:10.1021/jo00030a022
日期:1992.2
Photocyclization of aryl vinyl sulfides reportedly proceeds via thiocarbonyl ylide intermediates. The photochemical behavior of several aryl vinyl sulfides, which incorporate a pendant alkene side chain, was explored. In general, naphthyl and phenyl vinyl thioethers provided products which are consistent with photocyclization to a thiocarbonyl ylide intermediate followed by either intramolecular hydrogen shift or subsequent intramolecular ylide-alkene addition. Product distribution is influenced by solvent and temperature effects. Novel secondary photoprocesses were also observed during some reactions. Thus, irradiation of naphthyl vinyl sulfide 20 gave dihydrothiophene 22 which underwent subsequent intramolecular [2 + 2] cycloaddition to provide 24. Upon prolonged irradiation 24 undergoes a novel allylic sulfide rearrangement to provide 25.