Model studies related to the total synthesis of the fumitremorgins; the Pictet-Spengler cyclisation and the formation and intramolecular acylation of a 1,2-dihydro-β-carboline derivative
作者:David M. Harrison、Ram Bilas Sharma
DOI:10.1016/s0040-4020(01)89899-9
日期:1993.4
tetrahydro-β-carbolines 8, 9b, and 9d are described. The Pictet-Spengler reaction of L-tryptophyl-L-proline methyl ester with 3-methylbutanal gave the tetrahydro-β-carbolines 20 and 21; subsequent acid-catalysed cyclisation afforded the fumitremorgin analogues 22 and 23. The 2-(p-toluenesulphonyl)tetrahydro-β-carboline 27a furnished the unsaturated pentacycle 28a upon treatment with alkali.
Optically active pentacycles ( 13–18 ) were synthesized from L- and D-tryptophans, two of which ( 13 and 15 ) were alkylated and dehydrogenated to 21 and 22, respectively.
由L和D色氨酸合成了旋光性五环(13-18),其中两个(13和15)被烷基化并脱氢成21和22。
Reversal of multidrug resistance in human colon carcinoma cells
申请人:American Cyanamid Comany
公开号:US20020169111A1
公开(公告)日:2002-11-14
The present invention describes the use of fumitremorgin A, B and C and a series of diketopiperazines of Formula (I) to resensitize multidrug resistant (MDR) cancer cells to the cytotoxic effects of chemotherapeutic drugs.