A novel regio- and stereospecific hydrohalogenation reaction of 2-propynoic acid and its derivatives
摘要:
2-Propynoic acid and its derivatives are hydrohalogenated regio- and stereospecifically by reaction with lithium halides in acetic acid, or preferably with 1 equiv of acetic acid in refluxing CH3CN, to afford the thermodynamically unfavorable (Z)-3-halopropenoic acids and their derivatives as sole products. A rationale for the regio- and stereospecificity is briefly discussed.
Stereospecific alkylation of the Schiff base ester of alanine with 2-substituted-(E)- and -(Z)-vinyl bromides. An efficient synthesis of 2-methyl-(E)-3,4-didehydroglutamic acid, a potent substrate-induced irreversible inhibitor of L-glutamate-1-decarboxylase