Highly efficient Lewis acid-catalysed Pictet–Spengler reactions discovered by parallel screeningElectronic supplementary information (ESI) available: full experimental procedures. See http://www.rsc.org/suppdata/cc/b2/b212063a/
Sodium periodate oxidation of tetrahydro-β-carboline derivatives
作者:Franco Gatta、Domenico Misiti
DOI:10.1002/jhet.5570260302
日期:1989.5
The oxidation of some 3-(methoxy- and ethoxycarbonyl)tetrahydro-β-carboline derivatives with sodium periodate led to the formation of 1, 4-benzodiazonine derivatives or fully aromatic β-carbolines depending on both nature and number of substituents at 1-position.
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.
US6001847
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SANDRIN J.; SOERENS D.; HUTCHINS L.; RICHFIELD E.; UNGEMACH F.; COOK J. M+, HETEROCYCLES, 1976, 4, NO 6, 1101-1105