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 indole derivatives 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
描述了从二氢吲哚-2-硫酮1开始的吲哚衍生物的光化学合成。二氢吲哚-2-硫酮的照射1在烯烃的存在下3,得到2-烷基-3- ħ -indoles 4 - 7或2-烷基吲哚8 - 22穿过中间体的环切割,螺环氨基thietanes,最初由衍生[ [2 + 2]的1个CS键和3的CC键的环加成。在三烷基胺26存在下辐照1可获得脱硫产物27 – 32和意外的3-烷基吲哚33 – 40。Ñ -Acylindoline -2-硫酮11 - p,得到去酰基化的产品,二氢吲哚-2-硫酮1A - b,和乙酯43在CDC1照射时通过γ-H提取由激发硫代酰胺S-原子3 / EtOH或苯/乙醇 氧类似物2a - d也经过分子内H提取,以类似方式得到吲哚2-2-酮2e - f和乙酯43。