New Chiral Didehydroamino Acid Derivatives from a Cyclic Glycine Template with 3,6-Dihydro-2<i>H</i>-1,4-oxazin-2-one Structure: Applications to the Asymmetric Synthesis of Nonproteinogenic α-Amino Acids
作者:Rafael Chinchilla、Larry R. Falvello、Nuria Galindo、Carmen Nájera
DOI:10.1021/jo991736l
日期:2000.5.1
reactions using Corey's ylide for the asymmetric synthesis of 1-aminocyclopropane-1-carboxylic acids (ACCs) such as allo-corononamic and allo-norcoronamic acids. The hydrogenation reaction of these systems at ambient pressure in the presence of formaldehyde affords saturated oxazinones and N-methylated oxazinones which have been transformed into the N-methyl-alpha-amino acids (N-MAAs) (S)-2-(methylamino)butanoic
在手性甘氨酸等价物7缩合后,具有立体选择性地制备了具有3,5-二氢-2H-1,4-恶嗪-2-酮结构11a-f的新手性(Z)-α,β-二氢氨基酸(DDAA)衍生物。醛在K(2)CO(3)在温和的固液相转移催化反应条件下存在。这些新系统已用于使用Corey ylide的非对映选择性环丙烷化反应中,用于不对称合成1-氨基环丙烷-1-羧酸(ACC),例如异位-冠状醛酸和别基-异去甲环酸。这些体系在甲醛的存在下于环境压力下进行氢化反应,得到饱和的恶嗪酮和N-甲基化的恶嗪酮,它们已经转化为N-甲基-α-氨基酸(N-MAAs)(S)-2-(甲基氨基)丁酸和(S)-N-甲基亮氨酸。此外,