Photochemistyr of the Nitrogen-Thiocarbonyl Systems. 28. Photoreactions of Thiobarbiturates. Intermolecular Cycloaddition with Alkenes and Ring Contraction Reaction of Trithiobarbiturate.
Photochemical Transformation of Trithiobarbiturate into Thiohydantoin and Imidazolinothiophene Derivatives
摘要:
Upon irradiation of trithiobarbiturate (1), ring contraction reaction occurred to give thiohydantoin (2 or 3) and imidazolinothiophene (4) derivatives. Further, on treating with iodine, the thiohydantoins (2 and 3) undergo ring closure, giving imidazolinothiophene derivatives (4).
Photochemical Transformation of Trithiobarbiturate into Thiohydantoin and Imidazolinothiophene Derivatives
作者:Haruko Takechi、Hajime Takahashi、Minoru Machida
DOI:10.3987/com-98-s(h)24
日期:——
Upon irradiation of trithiobarbiturate (1), ring contraction reaction occurred to give thiohydantoin (2 or 3) and imidazolinothiophene (4) derivatives. Further, on treating with iodine, the thiohydantoins (2 and 3) undergo ring closure, giving imidazolinothiophene derivatives (4).
Photochemistyr of the Nitrogen-Thiocarbonyl Systems. 28. Photoreactions of Thiobarbiturates. Intermolecular Cycloaddition with Alkenes and Ring Contraction Reaction of Trithiobarbiturate.
作者:Haruko TAKECHI、Minoru MACHIDA
DOI:10.1248/cpb.45.1
日期:——
Upon irradiation of mono-, di-, and trithiobarbiturates in the presence of alkenes, [2+2]cycloaddition occurred regioselectively to give thietanes and their desulfurized products. In the case of trithiobarbiturate, a noevl type of ring contraction product, dithiohydantoin, was also obtained.