Stereoselective β-brominationofN-formyl-α, β-dehydroaminoacid esters5 was investigated. A reaction of5 with NBS affordedα-bromo-N-formylimines10 which successively isomerized to giveβ-bromo-N-formyl-α, β-dehydroaminoacid esters4. The migration of the double bond of the intermediates10 with bulky substituents at the β-position resulted in highly stereoselective formation of(Z)-4, while that of the
Methyl 1,5-disubstituted imidazole-4-carboxylates 1 were synthesised using methyl 3-substituted 3-bromo-2-isocyanoacrylates 3 (BICA), and the reaction mechanism was elucidated. Reactions of 3, which were prepared by bromination of 3-substituted 2-(formylamino)acrylates 6 followed by dehydration of the formylamino group, with a variety of primary amines gave imidazoles 1 in good overall yields. A mechanistic study suggested a Michael reaction of an amine with 3 followed by p-elimination of hydrogen bromide exclusively afforded (E)-N,3-disubstituted 3-amino-2-isocyanoacrylates 2. Geometric isomerization to (Z)-2 with a base and subsequent cyclization gave imidazoles 1.
Acidolysis of 2-Formylamino-2-alkenoic Esters to 2,3-Dehydro Amino Acid Esters
作者:Tamon Moriya、Kazuo Matsumoto、Muneji Miyoshi
DOI:10.1055/s-1981-29650
日期:——
MORIYA, TAMON;MATSUMOTO, KAZUO;MIYOSHI, MUNEJI, SYNTHESIS, BRD, 1981, N 11, 915-917