Volume 52, Issue 31 pp. 7990-7994
Communication

Bio-Inspired Dimerization Reaction of Tryptophan Derivatives in Aqueous Acidic Media: Three-Step Syntheses of (+)-WIN 64821, (−)-Ditryptophenaline, and (+)-Naseseazine B

Shinji Tadano

Shinji Tadano

Department of Chemistry, Graduate School of Science and Technology, Kumamoto University, 2-39-1, Kurokami, Chuo-ku, Kumamoto 860-8555 (Japan) http://www.sci.kumamoto-u.ac.jp/∼ishikawa/ishikawa-lab/Top.html

Search for more papers by this author
Yuri Mukaeda

Yuri Mukaeda

Department of Chemistry, Graduate School of Science and Technology, Kumamoto University, 2-39-1, Kurokami, Chuo-ku, Kumamoto 860-8555 (Japan) http://www.sci.kumamoto-u.ac.jp/∼ishikawa/ishikawa-lab/Top.html

Search for more papers by this author
Prof. Dr. Hayato Ishikawa

Corresponding Author

Prof. Dr. Hayato Ishikawa

Department of Chemistry, Graduate School of Science and Technology, Kumamoto University, 2-39-1, Kurokami, Chuo-ku, Kumamoto 860-8555 (Japan) http://www.sci.kumamoto-u.ac.jp/∼ishikawa/ishikawa-lab/Top.html

Department of Chemistry, Graduate School of Science and Technology, Kumamoto University, 2-39-1, Kurokami, Chuo-ku, Kumamoto 860-8555 (Japan) http://www.sci.kumamoto-u.ac.jp/∼ishikawa/ishikawa-lab/Top.htmlSearch for more papers by this author
First published: 20 June 2013
Citations: 94

This work was supported financially by a Grant-in-Aid for Scientific Research (B) (25288050) and Exploratory Research (25670005) from JSPS, a Grant-in-Aid for Scientific Research on Innovative Areas “Advanced Molecular Transformations by Organocatalysis” (No. 2304) (24105528) from MEXT, the Naito Foundation, the Uehara Memorial Foundation, the NOVARTIS Foundation (Japan) for the promotion of Science, a SUNBOR Grant from the Suntory Institute for Bioorganic Research, and the JGC-S Scholarship Foundation. We also thank Prof. Hiroshi Nishino (Kumamoto University), Prof. Ryo Irie (Kumamoto University), and Prof. Hiromitsu Takayama (Chiba University) for their support and guidance.

Graphical Abstract

Doubling up: The direct bio-inspired dimerization of commercially available amine-free tryptophan derivatives in aqueous acidic media provides C2-symmetrical and nonsymmetrical dimeric compounds. Further processing completes the concise syntheses of naturally occurring dimeric diketopiperazine alkaloids such as (+)-WIN 64821 (see picture) in overall yields of up to 20 %.

The full text of this article hosted at iucr.org is unavailable due to technical difficulties.