Phytochemical meanings of tetrahydro-β-carboline moiety in strictosidine derivatives
摘要:
Synthesis of 13 different tetrahydro-beta-carbolines (THBC) was accomplished by applying the Pictet-Spengler reaction with seven aldehydes, which have been coupled with tryptamine (6) and L-tryptophan methyl ester (7), respectively. The resulting products represent analogues of strictosidine (1) and carboxystrictosidine (5). They were investigated with respect to possible effects on herbivores in feeding bioassays upon the generalist Spodoptera littoralis. Maximum inhibition averages were 42% after four and 46% after six days for the most effective product (19) at 1000 ppm. Additionally, the frass of this particular bioassay was investigated via HPLC-UV for THBC digestion. All synthesized THBCs were also tested for their radical scavenger activity by monitoring their interaction with 2,2-diphenyl-1-picrylhydrazyl (DPPH). Compounds 16-20, 24 and 25 exhibited radical scavenging activity, ranging from 50% to 74% compared to that of a-tocopherol. All results were discussed with respect to possible contributions of tetrahydro-beta-carboline moieties in bioactivities of strictosidine (1) and its biodegradation products. (c) 2015 Elsevier Ltd. All rights reserved.
Synthesis of tetrahydro-β-carbolinediketopiperazines in [bdmim][PF6] ionic liquid accelerated by controlled microwave heating
作者:Ya-Hew Yen、Yen-Ho Chu
DOI:10.1016/j.tetlet.2004.09.056
日期:2004.10
Because of their negligible vapor pressures and large dipoles, ionic liquids are excellent media for microwave-accelerated organic reactions. Using low-power microwave irradiation in the new [bdmim][PF6] ionic liquid with temperature controlled at 60degreesC, a three-step synthesis (Pictet-Spengler, Schotten-Baumann, and intramolecular ester amidation) of tetraliydro-beta-carboline-diketopiperazines starting from tryptophan methyl ester was achieved with good isolated yields (49-69%) in only 5 min. (C) 2004 Elsevier Ltd. All rights reserved.
The Synthesis of Derivatives of β-Carboline. II. Syntheses from dl-Tryptophan and Aldehydes<sup>1</sup>
作者:H. R. Snyder、Corwin H. Hansch、Leon Katz、Stanley M. Parmerter、Earl C. Spaeth
DOI:10.1021/ja01181a063
日期:1948.1
Pictet-Spengler reactions in aprotic media. Stereospecificity in the Pictet-Spengler reaction
作者:Joseph Sandrin、Sean P. Hollinshead、James M. Cook
DOI:10.1021/jo00284a049
日期:1989.11
SANDRIN, JOSEPH;HOLLINSHEAD, SEAN P.;COOK, JAMES M., J. ORG. CHEM., 54,(1989) N3, C. 5636-5640
作者:SANDRIN, JOSEPH、HOLLINSHEAD, SEAN P.、COOK, JAMES M.