Synthesis of γ-oxo α-amino acids from L-aspartic acid
作者:Alexander S. Golubev、Norbert Sewald、Klaus Burger
DOI:10.1016/0040-4020(96)00942-8
日期:1996.11
of different γ-oxo α-amino acids from hexafluoroacetone protected L-aspartic acid chloride 1 via Stille cross coupling reaction is described. Stille reaction of 1 with vinyltributyltin followed by Lewis acid catalyzed intramolecular Michael addition provides access to 4-substituted pipecolicacidderivatives. An efficient synthesis of 5-hydroxy-4-oxo-L-norvaline 7 and a new approach to the 4-oxo-L-ornithine
A Simple Approach to Amino Acids with a Diazo Function in the Side Chain Starting from Aspartic Acid [2,2-Bis(trifluoromethyl)-5-oxo-1,3-oxazolidin-4-yl]acetic acid chloride (2) and diazoalkanes react to give the amino acid derivatives 2,2-bis(trifluoromethyl)-4-(3-diazo-2-oxopropyl)-1,3-oxazolidin-5-ones 3. Compounds 3 are useful intermediates for the synthesis of various natural and nonnatural α-amino acids and their derivatives. The synthetic potential is demonstrated i.a. by syntheses of 2-amino-5-hydroxy-4-oxopentanoic acid and 2-amino-4-oxohexanoic acid derivatives.