| 摘要 |
<p>4-N-Substituted amino-2-aza-1-oxabicyclo[3.3.0]oct-2- ene-6-carboxylic acid esters are prepared by reacting 2-azabicyclo[2.2.1]hept-5-en-3-one with an alcohol by the addition of a Brønsted acid to a mixture of both to form a salt of cis-4-amino-2-cyclopentene-1-carboxylic acid ester, reacting this salt with a compound for introducing an amino-protecting group in the presence of a base to form a cis-4-N-substituted amino-2-cyclopentene-1-carboxylic acid ester, and reacting this ester with a hypohalite and an aldoxime.</p> |
