Stereoselective Formal Total Synthesis of (+)-Methynolide
摘要:
A highly stereoselective and convergent formal total synthesis of (+)-methynolide is described. The salient features of this synthesis have been the construction of the C1-C7 and C8-C11fragments via a desymmetrization approach, Sharpless asymmetric epoxidation of an allyl alcohol, respectively, and linkage of both the fragments by Nozaki-Hiyama-Kishi reaction.
When mixtures of carboxylic acids or their sodium salts and alcohols were treated with 2-chloro-1,3,5-trinitrobenzene in the presence of pyridine under mild conditions, the corresponding carboxylic esters were formed. The yields and the rates of the ester formation depended on the types of the acids and the alcohols used.
Acyclic stereoselection. 9. Stereochemistry of the addition of lithium enolates to .alpha.-alkoxy aldehydes
作者:Clayton H. Heathcock、Steven D. Young、James P. Hagen、Michael C. Pirrung、Charles T. White、Don VanDerveer
DOI:10.1021/jo01307a023
日期:1980.9
Total Synthesis of (−)-4,8,10-Tridesmethyl Telithromycin
作者:Venkata Velvadapu、Tapas Paul、Bharat Wagh、Ian Glassford、Charles DeBrosse、Rodrigo B. Andrade
DOI:10.1021/jo201319b
日期:2011.9.16
Novel sources of antibiotics are required to address the serious problem of antibiotic resistance. Telithromycin (2) is a third-generation macrolide antibiotic prepared from erythromycin (1) and used clinically since 2004. Herein we report the details of our efforts that ultimately led to the total synthesis of (-)-4,8,10-tridesmethyl telithromycin (3) wherein methyl groups have been replaced with hydrogens. The synthesis of desmethyl macrolides has emerged as a novel strategy for preparing bioactive antibiotics.
FUGANTI C.; GRASSELLI P.; SERVI S.; LAZZARINI A.; CASATI P., J. CHEM. SOC. CHEM. COMMUN.,(1987) N 8, 538-539
作者:FUGANTI C.、 GRASSELLI P.、 SERVI S.、 LAZZARINI A.、 CASATI P.