Chemical studies of potential relevance to penicillin hypersensitivity. The synthesis of dl-2-phenoxymethylpenicillenic acid and of dl-2-(2,6-dimethoxyphenyl)penicillenic acid
作者:Kenneth H. Dudley、Daniel L. Bius、Dorothy Johnson
DOI:10.1002/jhet.5570100609
日期:1973.12
melhylpenicillenic acid (14) and of DL-2-(2, 6-dimethoxyphenyl)penicillenic acid (21) have been synthesized by the reaction of DL-penicillamine with 2 phenoxymethyl-4-(methoxymethylene)oxazol-5-one and 2-(2, 6-dimethoxyphenyl)-4-(ethoxymethylene)oxazol-5-one, respectively. These key oxazol-5-one intermediates were synthesized by azlactonization of the appropriately substituted penaldic acid dialkyl acetals
DL-2-苯氧基melhylpenicillenic酸(的晶体样品14)和DL -2-(2,6-二甲氧基苯基)penicillenic酸(21)已经由反应合成DL青霉胺与2-苯氧基甲基-4-(甲氧基亚甲基)恶唑-5-酮和2-(2,6-二二甲氧基苯基)-4-(乙氧基亚甲基)恶唑-5-酮。这些关键的恶唑-5-酮中间体是通过适当取代的戊二酸二烷基乙缩醛的壬二酸化反应合成的。研究了氯化汞(II)与D-苯氧基甲基青霉素的反应,发现不适用于D-14的合成。结晶DL的比较-和分别通过“恶唑酮”和“氯化汞(11)”方法制备的无定形D-2-(2,6-二甲氧基苯基)青霉烯酸(21)表明,其纯度明显提高。DL-材料。