Synthesis and cytotoxic evaluation of N2-benzylated quaternary β-carboline amino acid ester conjugates

• Published in: European journal of medicinal chemistry 2010-04, Vol.45 (4), p.1515-1523
• Main Authors: Ma, Chunming, Cao, Rihui, Shi, Buxi, Li, Shaoxue, Chen, Zhiyong, Yi, Wei, Peng, Wenlie, Ren, Zhenhua, Song, Huacan
• Format: Article
• Language: English
• Subjects: Amino Acids - chemistry; Antineoplastic agents; Benzyl Compounds - chemistry; Biological and medical sciences; Carbolines - chemistry; Cell Line, Tumor; Drug Screening Assays, Antitumor; Esters; General aspects; Humans; Magnetic Resonance Spectroscopy; Medical sciences; Pharmacology. Drug treatments; Spectrometry, Mass, Electrospray Ionization; Spectrophotometry, Infrared; Structure-Activity Relationship
• ISSN: 0223-5234; 1768-3254
• DOI: 10.1016/j.ejmech.2009.12.060

The beta-carboline alkaloids have been characterized as a class of potential antitumor agents. To further enhance the cytotoxic potency and improve water solubility of beta-carboline, a series of new beta-carboline amino acid ester, beta-carboline amino acid and N(2)-benzylated quaternary beta-carboline amino acid ester conjugates were designed and synthesized, and the cytotoxic activities of these compounds were evaluated using a panel of human tumor cell lines. The N(2)-benzylated quaternary beta-carboline amino acid ester conjugates represented the most interesting cytotoxic activities. Particularly, compounds 8b and 8g were found to be the most potent compounds with IC(50) values lower than 20 microM against all human tumor cell lines investigated. These results confirmed that the N(2)-benzyl substituent on the beta-carboline ring played an important role in the modulation of the cytotoxic potencies.