Asymmetric synthesis of substituted 1-aminocyclopropane-1-carboxylic acids from a new chiral glycine equivalent with 3,6-dihydro-2H-1,4-oxazin-2-one structure
作者:Rafael Chinchilla、Larry R Falvello、Nuria Galindo、Carmen Nájera
DOI:10.1016/s0957-4166(98)00244-4
日期:1998.7
Condensation of the new chiral glycine equivalent 10 with aldehydes at room temperature in the presence of K2CO3 under solid-liquid phase-transfer-catalysed conditions afforded stereoselectively new chiral (Z)-alpha,beta-didehydroamino acid (DDAA) derivatives with oxazinone structure 14. These systems have been used in diastereoselective cyclopropanation reactions for the synthesis of enantiomerically pure 1-aminocyclopropanecarboxylic acids (ACCs) such as (-)-allo-norcoronamic and (-)-allo-coronamic acids. (C) 1998 Elsevier Science Ltd. All rights reserved.
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