Synthesis of Indole Derivatives by [2 + 2] Photocycloaddition of Indoline-2-thiones with alkenes and photodesulfurization of indoline-2-thiones
作者:Takehiko Nishio、Mitsuru Oka
DOI:10.1002/hlca.19970800205
日期:1997.3.24
The photochemical synthesis of indolederivatives starting from the indoline-2-thiones 1 is described. Irradiation of indoline-2-thiones 1 in the presence of alkenes 3 gave 2-alkyl-3H-indoles 4–7 or 2-alkylindoles 8–22 through the ring cleavage of the intermediates, spirocyclic amino-thietanes, initially derived by [2 + 2] cycloaddition of the CS bond of 1 and the CC bond of 3. Irradiation of 1 in