A novel, double-asymmetric aldol approach to the synthesis of a 1β-methyl carbapenem antibiotic precursor
作者:Fumiyuki Shirai、Takeshi Nakai
DOI:10.1016/s0040-4039(00)82373-4
日期:1988.1
A novel synthetic approach to the 1β-methyl carbapenem key precursor is described which involves the chelation-controlled double-asymmetric aldol reaction as the key step.
The Eu(III)-catalyzed reaction of alpha-benzyloxyaldehydes with the (R)-3-hydroxybutanoate-derived ketene silyl acetal is shown to provide a higher level of both ''anti'' diastereofacial selection and rather unusual anti diastereoselection, compared with the conventional TiCl4-promoted version. The aldol adducts are elaborated to the carbapenem intermediates.
SHIRAI, FUMIYUKI;GU, JIN-HUA;NAKAI, TAKESHI, CHEM. LETT.,(1990) N0, C. 1931-1934