A convenient synthesis method for methylenomycin B and its application to methylenomycis A.
作者:Kennosuke TONARI、Kozo MACHIYA、Itsuo ICHIMOTO、Hiroo UEDA
DOI:10.1271/bbb1961.45.295
日期:——
A convenient synthesis method for methylenomycin B and its homolog, methylenomycin A, has been developed. Methylenomycin B, 2, 3-dimethyl-5-methylene-2-cyclopentenone (3) was synthesized: i) by methylation of Mannich derivative prepared from morpholine and 2, 3-dimethyl-2-cyclopentenone (5) or ii) by treatment of formalin with sodio derivatives of 2, 3-dimethyl-5-formyl-2-cyclopentenone (7a) and 2, 3-dimethyl-5-ethoxalyl-2-cyclopentenone (7b), both of which were easily prepared from 5 and ethyl formate or ethyl oxalate. 2, 3-Dimethyl-2, 3-epoxy-5- methylenecyclopentanone (2) was similarly prepared from the epoxide compound of 5 and ethyl oxalate. The bioassay of methylenomycin B and its related compounds against bacteria (B. subtilis, S. aureus, Ps. aeruginosa and E. coli) was also conducted. Methylenomycin A (1) and its desepoxy compound (17) were also prepared from 4-carboxy-2, 3-dimethyl-2-cyclopentenone (15) in the same procedure as described above.
开发了一种方便的合成方法用于合成美克霉素B及其同源物美克霉素A。美克霉素B,即2, 3-二甲基-5-亚甲基-2-环戊烯酮(3),可以通过以下两种方式合成:i)通过对由莫尔菲林和2, 3-二甲基-2-环戊烯酮(5)制备的曼尼希衍生物进行甲基化,或ii)通过处理福尔马林与2, 3-二甲基-5-醛基-2-环戊烯酮(7a)和2, 3-二甲基-5-乙氧基-2-环戊烯酮(7b)的钠衍生物,这两者均可轻易地由5和乙酸乙酯或乙氧基乙酸制备而成。2, 3-二甲基-2, 3-环氧-5-亚甲基环戊酮(2)则通过5的环氧化合物与乙氧基乙酸的反应类似合成。还进行了美克霉素B及其相关化合物对细菌(枯草芽孢杆菌、金黄色葡萄球菌、绿脓杆菌和大肠杆菌)的生物测定。同时,美克霉素A(1)及其去环氧化合物(17)也采用与上述相同的方法从4-羧基-2, 3-二甲基-2-环戊烯酮(15)中制备而成。