The design and synthesis of novel 3-[2-indol-1-yl-ethyl]-1H-indole derivatives as selective inhibitors of CDK4
摘要:
We present the design, synthesis and biological activity of novel 3-[2-indol-1-yl-ethyl]-1H-indole selective inhibitors of CDK4. (C) 2005 Elsevier Ltd. All rights reserved.
Total synthesis of the marine sponge pigment fascaplysin
作者:Benjamin Pelcman、Gordon W Gribble
DOI:10.1016/s0040-4039(00)97367-2
日期:——
Fascaplysin (1), an antimicrobial and cytotoxic red pigmentfrom the marinespongeFascaplysinopsissp., has been synthesized in seven steps from indole (65% yield). The pivotal intermediate in the synthesis is diindole 3 which is induced to undergo acid-catalyzed cyclization and dehydrogenation to afford the desired pentacycle 2 in > 90% yield. Peracid oxidation of 2 yields fascaplysin.
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.
Investigations into the mechanism of lactamization of lactones yielding in a novel route to biologically active tryptamine derivatives
The mechanism of lactamization of corresponding lactones was investigated by means of gas chromatography and synthesis of possible intermediates as references. Lactones react with amines via the amino acid with subsequent elimination of water to the corresponding lactams. In the first step, also hydroxyamides are in equilibrium with the lactones and amines, respectively, which are not able to form the amide though. This mechanism opens a new approach for the synthesis of N-beta-disubstituted tryptamines. (C) 2004 Elsevier Ltd. All rights reserved.
PELCMAN, BENJAMIN;GRIBBLE, GORDON W., TETRAHEDRON LETT., 31,(1990) N7, C. 2381-2384