Stereoselective Preparation
of C1-C10 and C11-O14 Fragments of Narbonolide:
Exploiting the Versatility of Thiazolidinethione Chiral Auxiliary
作者:Parthasarathi Das、C. Narasimhulu
DOI:10.1055/s-0028-1083321
日期:——
An efficient stereoselective synthesis of the C1-C10 and C11-O14 fragments of narbonolide, have been accomplished by using a thiazolidinonethione as chiral auxiliary. The stereocenters at C2, C3, C4, C5, C8, and C9 in C1-C10 fragment and C12 and C13 in C11-C14 fragment were generated via asymmetric acyl-thiazolidinethione aldol reactions whereas the stereocenter at C6 was installed by means of Myers
Total Synthesis of 10-Deoxymethynolide and Narbonolide
作者:Richeng Xuan、Hong-Se Oh、Younghoon Lee、Han-Young Kang
DOI:10.1021/jo702384d
日期:2008.2.1
flexible and convenient approach was developed for the synthesis of 10-deoxymethynolide (1) and narbonolide (2), which are aglycones of the methymycin and the pikromycin families of macrolide antibiotics. These lactones are produced by pikromycin polyketide synthase from Streptomyces venezuelae. Polyketide lactones, 10-deoxymethynolide and narbonolide, which contain 12- and 14-membered rings, respectively
Total Synthesis of 6-Deoxyerythronolide B via C–C Bond-Forming Transfer Hydrogenation
作者:Xin Gao、Sang Kook Woo、Michael J. Krische
DOI:10.1021/ja4008722
日期:2013.3.20
The 14-membered macrolide 6-deoxyerythronolide B is prepared in 14 steps (longest linear sequence) and 20 total steps. Two different methods for alcohol CH-crotylation viatransfer hydrogenation are deployed for the first time in target-oriented synthesis. Enyne metathesis is used to form the 14-membered ring. The present approach represents the most concise construction of any erythronolide reported
Biocatalytic Synthesis of Pikromycin, Methymycin, Neomethymycin, Novamethymycin, and Ketomethymycin
作者:Douglas A. Hansen、Christopher M. Rath、Eli B. Eisman、Alison R. H. Narayan、Jeffrey D. Kittendorf、Jonathan D. Mortison、Yeo Joon Yoon、David H. Sherman
DOI:10.1021/ja404134f
日期:2013.7.31
A biocatalytic platform that employs the final two monomodular type I polyketide synthases of the pikromycin pathway in vitro followed by direct appendage of D-desosamine and final C-H oxidation(s) in vivo was developed and applied toward the synthesis of a suite of 12- and 14-membered ring macrolide natural products. This methodology delivered both compound classes in 13 steps (longest linear sequence) from commercially available (R)-Roche ester in >10% overall yields.