申请人:Richardson-Merrell Inc.
公开号:US04325877A1
公开(公告)日:1982-04-20
5-Amino-4-oxo-pentanoic acids of the formula ##STR1## wherein R is CF.sub.3, CHF.sub.2 or CH.sub.2 F; R.sub.1 is H or akyl of 1-4 carbon atoms; and R.sub.2 is H or alkyl or 1-4 carbon atoms or benzyl, which are intermediates to ACE inhibitors or elastase inhibitors, are produced by reacting a 1-(methylthio)-1-methylsulfinyl)-2-R.sub.1 -ethylmetal with an ester of a 3-R-acrylic acid; optionally R.sub.2 -alkylating the thus-produced ester enolate anion of 4-(methylsulfinyl)-4-(methylthio)-5-R.sub.1 R-pentanoic acid followed by splitting off of methylsulfinic acid; reacting the thus-produced 2-R.sub.2 -5-R.sub.1 -4-(methylthio)-3-R-4-pentenoic acid ester with a source of Br.sup.+ to produce a 5-bromo-substituted acid or ester thereof otherwise corresponding to the desired 5-amino-4-oxo-pentanoic acid; and replacing the bromine atom with an amino group, e.g., via the corresponding 5-azido- and 5-N-acylamino- compounds, with hydrolysis of the ester group, if still remaining.
该公式表示为:##STR1## 其中R为CF.sub.3,CHF.sub.2或CH.sub.2F;R.sub.1为H或1-4个碳原子的烷基;R.sub.2为H或1-4个碳原子的烷基或苄基。这些化合物是制备ACE抑制剂或弹性蛋白酶抑制剂的中间体。方法是将1-(甲硫基)-1-甲基亚磺酰基)-2-R.sub.1-乙基金属与3-R-丙烯酸酯反应,然后选择性地对4-(甲硫基)-4-(甲硫基)-5-R.sub.1R-戊酸酯产生的酯烯醇阴离子进行R.sub.2-烷基化,随后分解甲硫酸;将所得的2-R.sub.2-5-R.sub.1-4-(甲硫基)-3-R-4-戊烯酸酯与Br.sup.+的源反应,以产生5-溴取代的酸或其酯,否则相应于所需的5-氨基-4-氧代戊酸;然后用氨基基团取代溴原子,例如通过相应的5-叠氮化合物和5-N-酰基氨基化合物,如果仍然存在酯基,则水解酯基。