Yan L, Liu FW, Dai GF, Liu HM. An efficient synthesis of quinoxaline derivatives from 4-chloro-4-deoxy-α-d-galactose and their cytotoxic activities.
Bioorg Med Chem Lett 2007;
17:609-12. [PMID:
17110108 DOI:
10.1016/j.bmcl.2006.11.007]
[Citation(s) in RCA: 24] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2006] [Revised: 10/31/2006] [Accepted: 11/02/2006] [Indexed: 11/28/2022]
Abstract
A novel and efficient method for the synthesis of quinoxaline derivatives has been developed. Isopropylidenation of 4-chloro-4-deoxy-alpha-D-galactose with 2,2-dimethoxypropane, followed by selective hydrolysis, afforded 2,3-O-isopropylidene-4-chloro-4-deoxy-D-galactose di-methyl acetal (3) as a sole product. Oxidation of compound 3 with (Bu3Sn)2O-Br2 gave corresponding hex-5-ulose derivative in high yields. The hex-5-ulose derivative reacted with o-phenylenediamines under neutral conditions to afford quinoxaline derivatives in reasonable yields. The in vitro cytotoxic activities of these quinoxaline derivatives were investigated.
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