Nucleophilic reaction of penicillin lactam with various lithiated compounds was discussed. Phenacyl benzylpenicillanate was reacted with phenylethynyllithium in tetrahydrofuran at -75°to yield a phenylethynyl derivative (2). When methyllithium or phenyllithium was used as the reagent in ether at -75°, only a ring-opened compound (4) was obtained. On the other hand, use of butyllithium or phenyllithium in tetrahydrofuran at -75° afforded an unexpected butoxycarbonyl derivative (5). The butoxyl group was derived from tetrahydrofuran, and which was confirmed by the formation of butanol from the reaction of tetrahydrofuran and phenyllithium at -75°.
讨论了
青霉素内酰胺与各种
锂化化合物的亲核反应。
苄基青霉酸苯
乙酯与
苯乙炔锂在
四氢呋喃中于 -75° 发生反应,生成
苯乙炔衍
生物 (2)。当使用
甲基锂或
苯基锂作为试剂在
乙醚中于-75°下反应时,只能得到开环化合物(4)。另一方面,在-75°的
四氢呋喃中使用丁
锂或
苯基锂,可以得到意想不到的丁氧羰基衍
生物(5)。丁氧基来自
四氢呋喃,并通过
四氢呋喃和
苯基锂在 -75° 下反应生成
丁醇而得到证实。