Volume 33, Issue 6 pp. 646-654
Full Paper

Low-Valent Titanium-Mediated Enantioselective Synthesis of Quinazolinone Alkaloids Circumdatins F, H, and Analogs

Shi-Peng Luo

Shi-Peng Luo

Department of Chemistry and Fujian Provincial Key Laboratory for Chemical Biology, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian 361005, China

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Hui Geng

Hui Geng

Department of Chemistry and Fujian Provincial Key Laboratory for Chemical Biology, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian 361005, China

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Yu Wang

Yu Wang

Department of Chemistry and Fujian Provincial Key Laboratory for Chemical Biology, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian 361005, China

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Pei-Qiang Huang

Corresponding Author

Pei-Qiang Huang

Department of Chemistry and Fujian Provincial Key Laboratory for Chemical Biology, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian 361005, China

Department of Chemistry and Fujian Provincial Key Laboratory for Chemical Biology, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian 361005, China, Tel.: 0086-0592-2182240; Fax: 0086-0592-2189959Search for more papers by this author
First published: 09 March 2015
Citations: 7

Abstract

We report the concise and protecting-group-free enantioselective total syntheses of circumdatins F and H. In view of the extreme importance of analogs of quinazolinone alkaloids in drug research and discovery, four analogs of bioactive quinazolinobenzodiazepine alkaloids, including demethoxycircumdatin H (12) and N-demethylbenzomalvin A (13), have been synthesized. The method is based on the low-valent titanium-promoted intramolecular reductive coupling of imides with o-nitrobenzimides, which yielded quinazolino[3,2-a][1,4]benzodiazepines under mild conditions. In addition, heptacyclic dehydraasperlicin E (16) has been synthesized from asperlicin C by a NCS-mediated dehydra-cyclization reaction.

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