The enantiomer of anisine has been synthesized (from l-tryptophan) with 100% diastereoselectivity via the asymmetric PictetΒ±Spengler reaction coupled with a Pd 0 (enolate mediated) coupling process. This enantiomer has also been converted into a key intermediate which provides a route to the enantio
Enantiospecific total synthesis of the enantiomer of the indole alkaloid intermediate macroline
β Scribed by Xiaoxiang Liu; Chunchun Zhang; Xuebin Liao; James M. Cook
- Publisher
- Elsevier Science
- Year
- 2002
- Tongue
- French
- Weight
- 172 KB
- Volume
- 43
- Category
- Article
- ISSN
- 0040-4039
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β¦ Synopsis
The total synthesis of the enantiomer 3En of macroline 3 was completed (from L-tryptophan methyl ester 6) in an overall yield of 12.3% (11 isolated intermediates). The corresponding macroline equivalent 18 was prepared in 14.3% yield. This work provides, for the first time, an opportunity to synthesize mismatched bisindole alkaloids for studies on the mechanism of action of Alstonia antimalarial alkaloids at the receptor level.
π SIMILAR VOLUMES
The tetrahedrane framework with R=tBu and the octabisvalene framework with R = CH3 presumably form because of steric reasons. Whereas the hydrocarbon 2 is highly strained, the arrangement in 1 is largely strain-free, based on the intermolecular contact distances. With other residues R the occurrenc