Synthesis of 4-(methoxyethyl) monobactams by a chemicoenzymatic approach.
作者:HARUO YAMASHITA、NOBUYOSHI MINAMI、KYOICHI SAKAKIBARA、SUSUMU KOBAYASHI、MASAJI OHNO
DOI:10.1248/cpb.36.469
日期:——
As a key intermediate for the synthesis of monobactam analogues, cis-3-benzyloxycarbonyl-amino-4-(2-hydroxyehtyl)-2-azetidinone was synthesized from (4S)-4-methoxycarbonylmethyl-2-azetidinone, and converted into monobactams having a methoxyethyl group at the C-4 position of the β-lactam ring. Among the compounds synthesized, disodium (3S, 4R)-3[2-(2-aminothiazol-4-yl)-(Z)-2-carboxymethoxyiminoacetamido]-4-(2-methoxyethyl)-2-azetidinone-1-sulfonate showed strong activity against a variety of gram-negative bacteria except Pseudomonas aeruginosa. Furthemore, the 4-methoxyethyl derivatives exhibited excellent stabiliy to β-lactamases, and the syntheses of the corresponding trans isomer and 3α-methoxy derivatives are also described.
作为合成单环β内酰胺类似物的关键中间体,顺-3-苄氧基羰基氨基-4-(2-羟乙基)-2-氮杂环丁酮是由(4S)-4-甲氧基羰基甲基-2-氮杂环丁酮合成的,并转化为在β-内酰胺环C-4位具有甲氧乙基基团的单环β内酰胺。在合成的化合物中,双钠盐(3S, 4R)-3[2-(2-氨基噻唑-4-基)-(Z)-2-羧基甲氧基亚胺乙酰氨基]-4-(2-甲氧乙基)-2-氮杂环丁酮-1-磺酸盐对多种革兰阴性细菌表现出强活性,除了铜绿假单胞菌。此外,4-甲氧乙基衍生物对β-内酰胺酶显示出优异的稳定性,并且相应的反式异构体和3α-甲氧基衍生物的合成也被描述。