Synthesis 2007(5): 669-674  
DOI: 10.1055/s-2007-965907
PAPER
© Georg Thieme Verlag Stuttgart · New York

Total Synthesis of Marine Bisindole Alkaloid (+)-cis-Dihydrohamacanthin B

Kazuhiro Higuchi, Ryousuke Takei, Takashi Kouko, Tomomi Kawasaki*
Meiji Pharmaceutical University, 2-522-1 Noshio Kiyose, Tokyo 204-8588, Japan
Fax: +81(042)4958764; e-Mail: kawasaki@my-pharm.ac.jp;
Further Information

Publication History

Received 20 October 2006
Publication Date:
25 January 2007 (online)

Abstract

The total synthesis of the marine bisindole alkaloid (+)-cis-dihydrohamacanthin B was achieved from optically pure (R)-indolylglycinol.

7

In the former synthesis of unnatural 2c from (S,R)-3, its diastereomer (R,R)-5 was also obtained. [6] So, we initially used (R,R)-5 for the approach to natural 2c.

8

The catalytic hydrogenation (H2, Pd/BaSO4) of (R,R)-4 was also not successful.

12

As described in the previous report, [6] there was no facial selectivity between E- and Z-isomers of 8 at the azidation step.

14

The enantiomeric excess of 10 was determined by its HPLC compared with that of racemic sample.