A cross metathesis approach to the synthesis of the C11–C23 fragment of (−)-16-normethyldictyostatin
摘要:
The synthesis of the C11-C23 fragment 2 of (-)-16-normethyldictyostatin has been achieved by cross metathesis between two olefinic fragments 4 and 5 followed by a reduction of the double bond at C16-C17. Both the olefinic fragments are easily synthesized in a diastereoselective manner from the common precursor alcohol 7. (c) 2006 Elsevier Ltd. All rights reserved.
Odoamide is a novelcyclic depsipeptide with highly potent cytotoxic activity isolated from the Okinawan marine cyanobacterium Okeania sp. It contains a 26-membered macrocycle composed of a fatty acid moiety, a peptide segment and isoleucic acid. Four possible stereoisomers of the odoamide polyketide substructure were synthesised using a chiral pool approach. The first total synthesis of odoamide was
Total Synthesis of 10-Deoxymethynolide, the Aglycon of the Macrolide Antibiotic 10-Deoxymethymycin
作者:Ronaldo A. Pilli、Carlos Kleber Z. de Andrade、Carlos Roberto O. Souto、Armin de Meijere
DOI:10.1021/jo9809433
日期:1998.10.1
A short and efficient total synthesis of 10-deoxymethynolide (2c), the aglycon of 10-deoxymethymycin (1c), has been accomplished in 16 steps and 12% overall yield from (S)-3-O-p-toluenesulfonyl-3-hydroxy-2-methylpropanal (15c). The synthesis features an expeditious preparation of (+)-5a, a synthetic equivalent of the Prelog-Djerassi lactonic acid, and the construction of a 12-membered lactone through an intramolecular Nozaki-Hiyama-Kishi coupling reaction.