4-N-substituted amino-2-aza-1-oxabicyclo[3.3.0]oct-2-ene-6-carboxylic acid esters are produced by adding a Brønsted acid to a mixture of a 2-azabicyclo[2.2.1]hept-5-en-3-one and an alcohol, thereby causing these components to react with each other to give a salt of cis-4-amino-2-cyclopentene-1-carboxylic acid ester, then allowing the salt of cis-4-amino-2-cyclopentene-1-carboxylic acid ester thus obtained to react with an amino-protecting group introducing compound in the presence of a base, thereby giving cis-4-N-substituted amino-2-cyclopentene-1-carboxylic acid ester, and then allowing this cis-4-N-substituted amino-2-cyclopentene-1-carboxylic acid ester to react with a hypohalogenite and an aldoxime.
4-N-取代
氨基-2-氮杂-1-氧杂双环[3.3.0]辛-2-烯-6-
羧酸酯是通过向
2-氮杂双环[2.2.1]庚-5-烯-3-酮和醇的混合物中加入Brønsted酸,使这些组分相互反应以形成顺式-4-
氨基-
2-环戊烯-1-羧酸酯的盐,然后允许所得到的顺式-4-
氨基-
2-环戊烯-1-羧酸酯的盐在碱的存在下与
氨基保护基引入化合物反应,从而给出顺式-4-N-取代
氨基-
2-环戊烯-1-羧酸酯,然后允许这种顺式-4-N-取代
氨基-
2-环戊烯-1-羧酸酯与次卤酸盐和醛
肟反应而制得。