A process for the preparation of 1-alkyl-3-carboxy-4-cinnolones.
申请人:PROFARMACO NOBEL S.r.l.
公开号:EP0287853B1
公开(公告)日:1994-10-19
US4956460A
申请人:——
公开号:US4956460A
公开(公告)日:1990-09-11
IMPROVED SYNTHESIS OF NTTRILES OF QUINOLONE ANTIBIOTICS
作者:Keith A. Korthals、Thomas J. Delia
DOI:10.1080/00304940409355977
日期:2004.12
The quinolone antibiotics flumequine (l), nalidixic acid (2), oxolinic acid (3), and cinoxacin (4) were selected. In view of the fact that the structural features of the bketoacids would seem to preclude facile decarboxylation, it was surprising that the formation of the corresponding nitriles proved more challenging than anticipated. Initial attempts which included the following reactions: a) thermal
选择喹诺酮类抗生素氟甲喹(1)、萘啶酸(2)、恶唑酸(3)和西诺沙星(4)。鉴于酮酸的结构特征似乎排除了容易脱羧的事实,令人惊讶的是,相应腈的形成被证明比预期更具挑战性。最初的尝试包括以下反应:a) 3-[(3,4-亚甲二氧基苯基)氨基]-2氰基丙烯酸乙酯的热环化直接得到二氢6恶啉酸 (3) 的脱乙腈,b) 羧酸的微波辐射( 14) 在尿素和氨基磺酸的存在下生成酰胺并诱导其脱水为腈,以及 c) 使用氯磺酰基异氰酸酯诱导酰胺的形成并随后消除为腈,所有这些都产生低产率!