Preparation of Cyclic and Bicyclic β-Amino Acids Derivatives from Methyl 6-Ethoxy-5,6-dihydro-4H-1,2-oxazine-4-carboxylate
作者:Alexander A. Tishkov、Hans-Ulrich Reissig、Sema L. Ioffe
DOI:10.1055/s-2002-31908
日期:——
The readily available methyl 6-ethoxy-5,6-dihydro-4H-1,2-oxazine-4-carboxylate (1) was alkylated at C-4 and acylated at the nitrogen atom. 1,2-Oxazine 1 and the resulting new substituted 1,2-oxazines 2 and 3 were suitableprecursors for the preparation of derivatives of β-proline, nipecotic acid, as well as indolizine-6- and quinolizine-3-carboxylic acids.
容易获得的 6-乙氧基-5,6-二氢-4H-1,2-恶嗪-4-羧酸甲酯 (1) 在 C-4 处被烷基化并在氮原子处被酰化。1,2-恶嗪 1 和所得的新取代的 1,2-恶嗪 2 和 3 是制备 β-脯氨酸、尼泊克酸以及 indolizine-6- 和 quinolizine-3- 羧酸衍生物的合适前体。