An enantioselective synthesis of the C1C9 segment of antitumor macrolide peloruside A
✍ Scribed by Arun K. Ghosh; Jae-Hun Kim
- Publisher
- Elsevier Science
- Year
- 2003
- Tongue
- French
- Weight
- 174 KB
- Volume
- 44
- Category
- Article
- ISSN
- 0040-4039
No coin nor oath required. For personal study only.
✦ Synopsis
A stereocontrolled synthesis of the C 1 C 9 segment of the marine natural product peloruside A is described. The key steps involve Sharpless's catalytic asymmetric dihydroxylation reaction, a chelation-controlled reduction of chiral b-alkoxy ketones to elaborate the syn-1,3-diol functionality and a ring-closing olefin metathesis of a homoallylic alcohol-derived acrylate ester to form an a,b-unsaturated d-lactone.
📜 SIMILAR VOLUMES
An asymmetric synthesis of the C3-C13 segment of rhizoxin is described in which the relative stereochemistry of C7 and C8 is established through a chelation-controlled allylation followed by Mitsunobu inversion, and the pyran ring is constructed by a photochemically initiated 6-exo radical cyclizati
The CI-C9 segment of epothilons was generated by an aldol reaction between chiral aldehyde 3 and ethyl ketone 4. Removal of the TBS protecting groups and debenzylation generated spiro ketal 13 which was analyzed by X-ray crystallography.
A stereoselective synthesis of the C 1 -C 12 segment of the potent cytotoxic macrolide, iriomoteolide 1a, has been accomplished. The key steps involve an enzymatic kinetic resolution of a b-hydroxy amide, a Pd-catalyzed cross-coupling to construct a substituted allylsilane, a highly and stereoselect
The Ct-Ct3 segment 6 of concanamycin A (1) was prepared by a highly stereocontrolled route (87% overall ds) in 16 steps from the ester 9. Key steps are the one-pot aldol/reduction, 8 + 12, and the HWB reaction, 18 + 19 + 6.8 1997 Elsevier Science Ltd.