.BETA.-Hydroxy-.DELTA.-lactones as chiral building blocks involving 1,3-dihydroxyl functions. 1. New strategies for stereoselective construction of 2-methyl-3,5-dihydroxy esters.
Concise Stereoselective Total Synthesis of (4R, 6R)-Lactone Moiety Analog of Mevinoline and Compactin
摘要:
A simple and highly efficient synthetic route has been developed for analogue of HMGCo A reductase inhibitor (1). The strategy utilizes S-Corey-Bakshi-Shibata (CBS) reduction, FeCl3-catalyzed C-H insertion of ethyl diazoacetate. [Supplementary materials are available for this article. Go to the publisher's online edition of Synthetic Communications (R) for the following free supplemental resource: Full experimental and spectral details.]
An efficient and versatile synthetic method for the stereoselective synthesis of a mevinicacid analogue is described. This approach uses a combination of a Cosford protocol with a catecholborane-mediated stereoselective reduction of acyclic P-hydroxy ketones to syn-1,3-diols, as key steps.
Organocatalytic Asymmetric Peroxidation of γ,δ-Unsaturated β-Keto Esters—A Novel Route to Chiral Cycloperoxides
作者:Mary C. Hennessy、Hirenkumar Gandhi、Timothy P. O’Sullivan
DOI:10.3390/molecules28114317
日期:——
A methodology for the asymmetric peroxidation of γ,δ-unsaturated β-ketoesters is presented. Using a cinchona-derived organocatalyst, the target δ-peroxy-β-keto esters were obtained in high enantiomeric ratios of up to 95:5. Additionally, these δ-peroxy esters can be readily reduced to chiral δ-hydroxy-β-keto esters without impacting the β-ketoester functionality. Importantly, this chemistry opens