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Synthesis of the C1-C9 fragment of (-)dictyostatin and studies toward the total synthesis of (+)-tautomycetin

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Danilo Pereira de Sant'ana
Total Authors: 1
Document type: Doctoral Thesis
Press: Campinas, SP.
Institution: Universidade Estadual de Campinas (UNICAMP). Instituto de Química
Defense date:
Examining board members:
Luiz Carlos Dias; Damien Prim; Vitor Francisco Ferreira; Paulo Cesar Muniz de Lacerda Miranda; Paulo José Samenho Moran
Advisor: Jean Marc Campagne; Luiz Carlos Dias

SYNTHESIS OF THE C1-C9 FRAGMENT OF (-)-DICTYOSTATIN: (-)-Dictyostatin is a marine macrolactone with potent antitumor activity. Herein, we report the development of a new synthetic route for the C1-C9 fragment of this natural product. The C1-C9 fragment of (-)-dictyostatin was synthesized in 15 steps and 3.57% overall yield from 1,3-propanediol. Our synthetic route employed Sharpless asymmetric epoxidation and epoxide opening under Myashita's conditions as key steps to form the stereogenic centers. The C1-C9 fragment contains the 2Z,4E diene and two stereogenic centers (C6R, C7S) contained in the natural product. STUDIES TOWARD THE TOTAL SYNTHESIS OF (+)-TAUTOMYCETIN: (+)-Tautomycetin is a polyketide natural product isolated in 1989 from Streptomyces griseochromogenes with antifungal activity. Currently, TTN is best known for its activity in serine/threonine phosphatase proteins. We developed a convergent synthetic route to this natural product. Two key fragments of (+)-tautomycetin were synthesized, the B2 fragment containing the C1-C12 chain and the compound 260, corresponding to the C7'-C13 fragment of (+)-tautomycetin. The synthesis of fragment B2 employed a stereoselective chiral epoxide opening reaction as a key step, which consist of a novel strategy to prepare the desoxypropionate moiety of TTN. The synthesis of 260 employed a novel method for bis-esterification of anhydrides developed in the Dias-Campagne groups (AU)

FAPESP's process: 09/09176-9 - Total synthesis of the natural products dictiostatin, Tautomycetin and analogues
Grantee:Danilo Pereira de Sant'Ana
Support Opportunities: Scholarships in Brazil - Doctorate