An unexpected rearrangement of 3-unsubstituted-2-acyl substituted indole phenylhydrazones. A new method for benz[c]β-carboline synthesis
作者:Olga V. Baranova、Sergey V. Dubovitskii
DOI:10.1016/j.tetlet.2003.11.059
日期:2004.2
A new type of rearrangement of 3-unsubstituted-2-acyl substituted indole phenylhydrazones with formation of a quinoline ring under acid catalysed conditions was observed.
Total syntheses of the marine sponge pigments fascaplysin and homofascaplysin B and C
作者:Gordon W. Gribble、Benjamin Pelcman
DOI:10.1021/jo00039a024
日期:1992.6
The Fascaplysinopsis spp. marine sponge pigments fascaplysin (1), homofascaplysin B (4), and homofascaplysin C (5) have been synthesized by peracid oxidation, reaction with oxalyl chloride/methanol, or Vilsmeier formylation, respectively, of the keystone intermediate 12H-pyrido[1,2-a:3,4-b']diindole (7). The versatile 7 was prepared from indole (17) in six steps (78% yield), a sequence in which the key reaction is the trifluoroacetic acid-induced ring closure of diindole 15, followed by Pd/C-catalyzed dehydrogenation of the crude mixture of cyclized products 25, 26, to give 7 in 93% yield from 15.
PELCMAN, BENJAMIN;GRIBBLE, GORDON W., TETRAHEDRON LETT., 31,(1990) N7, C. 2381-2384