申请人:Polaroid Corporation
公开号:US04304934A1
公开(公告)日:1981-12-08
This invention relates to a method of synthesizing 3-amino-2-hydroxy-2-cyclopentenones possessing an aliphatic substituent in the 4-position which comprises reacting cyanoacetamide with an aliphatic aldehyde to yield the corresponding .beta.-substituted-.alpha.,.alpha.'-dicyanoglutaramide, hydrolyzing the amide to the corresponding .beta.-substituted glutaric acid, esterifying the acid to the corresponding dialkyl diester, converting the diester to a 1,2-bis(trimethylsiloxy)-4-substituted cyclopentene by reductive cyclization using chlorotrimethylsilane in the presence of sodium, hydrolyzing and oxidizing the bis(trimethylsiloxy) compound to the 2-hydroxy-4-substituted-2-cyclopentenone in the presence of a cupric salt, nitrosating the 2-cyclopentenone to the 2-hydroxy-4-substituted-5-oximino-2-cyclopentenone, converting the oxime to the 2-acetoxy-3-amino-4-substituted-2-cyclopentenone by reductive acetylation and removing the acetyl group by alkanolysis to yield the 3-amino-2-hydroxy-4-substituted-2-cyclopentenone product.
本发明涉及一种合成4-位具有脂肪基取代基的3-氨基-2-羟基-2-环戊烯酮的方法,其包括将氰乙酰胺与脂肪醛反应以得到相应的β-取代的α,α'-二氰基谷氨酰胺,加水解胺得到相应的β-取代谷氨酸,酯化酸得到相应的二烷基二酯,通过还原性环化将二酯转化为1,2-双(三甲基硅氧基)-4-取代环戊烯,使用氯化三甲基硅在钠的存在下进行还原性环化,加水解和氧化双(三甲基硅氧基)化合物,在铜盐的存在下使2-环戊烯酮亚硝化为2-羟基-4-取代-5-肟基-2-环戊烯酮,通过还原性乙酰化将肟转化为2-乙酰氧基-3-氨基-4-取代-2-环戊烯酮,通过醇解去除乙酰基,得到3-氨基-2-羟基-4-取代-2-环戊烯酮产物。