Photoreactions of isoindoline-1-thiones with alkenes: unusual formation of tricyclic isoindolines
摘要:
Photochemical cycloaddition reactions of cyclic thioamides and alkenes have been examined. Irradiation of 2-arylisoindoline-1-thiones 1 in the presence of alkenes 2 gave the unexpected tricyclic isoindolines 3-18. The formation of tricyclic isoindolines can best be explained in terms of the intermediacy of aminospirothietane 27, formed by [2 + 2] photocycloaddition of the C=S double bond of 1 to the C=C double bond of 2. Ring cleavage of the resultant amino thietane, assisted by the participation of the nitrogen lone-pair electrons, produced zwitterions 28 and 29 or 1-mercaptoethylisoindole (30). Subsequent nucleophilic attack of the thiol anion on the iminium carbon of 29 or attack of the thiol group on C-3 of 30 gave the final products. Irradiation of isobenzofuran-1-thione (22) and isobenzothiophene-l-thione (23) in the presence of tetramethylethylene (2a) gave the corresponding spirothietanes 24 and 25.
1-Ethylthio-2R-isoindoles. An example of nonsynchronous addition in the diels-alder reaction
作者:V. A. Kovtunenko、T. T. Dobrenko、Z. V. Voitenko、A. K. Tyltin、F. S. Babichev
DOI:10.1007/bf00506392
日期:1984.9
KOVTUNENKO, V. A.;TYLTIN, A. K.;DOBRENKO, T. T.;BABICHEV, F. S., YKP. XIM. ZH., 1983, 49, N 10, 1099-1103
作者:KOVTUNENKO, V. A.、TYLTIN, A. K.、DOBRENKO, T. T.、BABICHEV, F. S.
DOI:——
日期:——
Photoreactions of isoindoline-1-thiones with alkenes: unusual formation of tricyclic isoindolines
作者:Takehiko Nishio、Norikazu Okuda
DOI:10.1021/jo00040a049
日期:1992.7
Photochemical cycloaddition reactions of cyclic thioamides and alkenes have been examined. Irradiation of 2-arylisoindoline-1-thiones 1 in the presence of alkenes 2 gave the unexpected tricyclic isoindolines 3-18. The formation of tricyclic isoindolines can best be explained in terms of the intermediacy of aminospirothietane 27, formed by [2 + 2] photocycloaddition of the C=S double bond of 1 to the C=C double bond of 2. Ring cleavage of the resultant amino thietane, assisted by the participation of the nitrogen lone-pair electrons, produced zwitterions 28 and 29 or 1-mercaptoethylisoindole (30). Subsequent nucleophilic attack of the thiol anion on the iminium carbon of 29 or attack of the thiol group on C-3 of 30 gave the final products. Irradiation of isobenzofuran-1-thione (22) and isobenzothiophene-l-thione (23) in the presence of tetramethylethylene (2a) gave the corresponding spirothietanes 24 and 25.
KOVTUNENKO, V. A.;DOBRENKO, T. T.;VOJTENKO, Z. V.;TYLTIN, A. K.;BABICHEV,+, XIMIYA GETEROTSIKL. SOEDIN., 1984, N 9, 1200-1205
作者:KOVTUNENKO, V. A.、DOBRENKO, T. T.、VOJTENKO, Z. V.、TYLTIN, A. K.、BABICHEV,+