Harmine derivatives, intermediates used in their preparations, preparation processes and use therefo
申请人:Wu Jialin
公开号:US20090227619A1
公开(公告)日:2009-09-10
This invention relates to compounds of general formula (I), wherein R
1
, R
2
, R
3
, R
4
and R
5
are as defined in the specification; intermediates used in their preparation, preparation processes and use thereof. The present invention produces new harmine derivatives with enhanced antitumour activity and lower nervous system toxicity by structurally modification of the parent structure of β-carboline of harmines at position 1, 2, 3, 7 and 9. The compounds of the present invention can be prepared easily with high yield. They can be used in manufacture of a variety of antitumour medicines and medicines used in treatment of tumour diseases in combination of light or radiation therapy.
Harmine derivatives, intermediates used in their preparations, preparation processes and use thereof
申请人:Wu Jialin
公开号:US08772311B2
公开(公告)日:2014-07-08
This invention relates to compounds of general formula (I), wherein R1, R2, R3, R4 and R5 are as defined in the specification; intermediates used in their preparation, preparation processes and use thereof. The present invention produces new harmine derivatives with enhanced antitumor activity and lower nervous system toxicity by structurally modification of the parent structure of β-carboline of harmines at position 1, 2, 3, 7 and 9. The compounds of the present invention can be prepared easily with high yield. They can be used in manufacture of a variety of antitumor medicines and medicines used in treatment of tumor diseases in combination of light or radiation therapy.
To further our SAR study on the chemistry and antitumor activity/neurotoxicity of beta-carboline alkaloids. several series of beta-carboline derivatives with various substituents were designed and synthesized from the starting material L-tryptophan on the basis of harmine chemical structure. Cytotoxic activities of these compounds were investigated in vitro. The results showed that some beta-carboline derivatives had significant cytotoxic activities against human tumor cell lines. Among all the synthesized beta-carboline derivatives, the compounds 27, 28 and 32, having a benzyl substituent at both position-2 and 9, respectively, were found to be the most potent compounds with IC50 value lower than 50 mu M against all human tumor cell lines examined. Acute toxicities and antitumor activities of the selected beta-carboline derivatives in mice were also evaluated. The results demonstrated that a benzyl substituent at position-2 increased the antitumor activity as well as acute toxicity significantly. However an (ethoxycarbonyl)amino substituent at position-3 reduced the acute toxicity as well as antitumor activity remarkedly. These data suggested that (1) the antitumor potencies of beta-carboline derivatives were enhanced by the introduction of benzyl substituent into the position-2; (2) the acute toxicity of beta-carboline derivatives reduced dramatically by the introduction of an appropriate substituent into the position-3 and 9; (3) the beta-carboline structure might be an important basis for the design and synthesis of new antitumor drugs with significant antitumor activity and low toxicity. (c) 2005 Elsevier SAS. All rights reserved.
MEHTA, PRATIBHA;SAXENA, ANIL K.;GULATI, A.;ANAND, NITYA, INDIAN J. CHEM. B, 27,(1988) N 2, C. 140-143