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期刊论文

A Solid-Phase Approach to Fluorobenzimidazoles and Fluoro-2-hydroxy-quinoxalines Using 'One-Bead-Two-Compound' Method

魏贤勇Ya-Fei Ji*a Xian-Dao Pan b Xian-Yong Wei c

SYNLETT 2004, No. 9, pp 1607-1609,-0001,():

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摘要/描述

A solid-phase approach to fluorobenzimidazoles 6a and fluoro-2-hydroxyquinoxalines 6b has been achieved by a new strategy of 'one-bead-two-compound'. The precursor, 6-nitro-2,3,4,5- tetrafluorobenzoic acid, was tagged to Rink amide MBHA resin via an α-amino acid linker. The first nucleophilic substitution generated two regioisomers in which the second active fluorine atom underwent a subsequent nucleophilic substitution with a primary amine. The reduction of the aryl nitro groups with SnCl2·2H2O/NMM and the formation of a five-membered ring with aldehydes afforded 4b and 5a. Fluorobenzimidazoles 6a were directly furnished by cleavage using TFA, therewith the stable six-membered ring 6b was produced by concomitant intramolecular cyclization and thermal dehydrogenation. In addition to introduction of fluorine into the heterocycles, two scaffolds could be simultaneously synthesized with this method.

【免责声明】以下全部内容由[魏贤勇]上传于[2004年12月28日 20时50分46秒],版权归原创者所有。本文仅代表作者本人观点,与本网站无关。本网站对文中陈述、观点判断保持中立,不对所包含内容的准确性、可靠性或完整性提供任何明示或暗示的保证。请读者仅作参考,并请自行承担全部责任。

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