A Flexible Approach to Methyl
(5<i>S</i>)-5-Alkyltetramate Derivatives
作者:Jian-Feng Zheng、Pei-Qiang Huang、Li-Jiao Jiang、Hong-Qiao Lan、Jian-Liang Ye
DOI:10.1055/s-0028-1087672
日期:——
Regioselective Grignard reagent additions to 3-methoxymaleimides and subsequent diastereoselective reductive dehydroxylation of the resulting N,O-acetals were studied. On the basis of these studies, a flexible and highly regio- and diastereoselective approach to methyl 5-alkyltetramate derivatives was disclosed. The method is the first direct and flexible asymmetric cationic synthon-based approach, and allows for the synthesis of various methyl (5S)-5-alkyltetramate derivatives that are otherwise inaccessible by the commonly used methods based on α-amino acids.
Regioselective Reduction of 3-Methoxymaleimides: An Efficient Method for the Synthesis of Methyl 5-Hydroxytetramates
作者:Fatiah Issa、Joshua Fischer、Peter Turner、Mark J. Coster
DOI:10.1021/jo0605750
日期:2006.6.1
various N-alkyl-3-methoxymaleimides, synthesized by base-promoted N-alkylation of 3-methoxymaleimide, were reduced using sodium borohydride with complete regioselectivity. The resultant methyl 5-hydroxytetramates are useful intermediates in the synthesis of a variety of tetramate derivatives.