DERIVATIVES OF HETEROCYCLIC α-IMINOCARBOXYLIC ACIDS. 3. SYNTHESIS OF N-ALKOXYCARBONYL AND N-ALKOXYCARBONYLALKENYL DERIVATIVES OF α-IMINOCARBOXYLIC ACIDS.

Article abstract of DOI:10.1007/BF00532038

By the interaction of L-proline, L-thioproline, pipecolic acid, tetrahydro-1,4-thiazine-3-carboxylic acid, and diastereomeric esters of tetrahydro-1,4-thiazine-3,5-dicarboxylic acid with methyl chloroformate, methyl propiolate, and acetylenecarboxylic aci