Alkylation of 1-[<i>N</i>-(Hydroxymethyl)-<i>N</i>-methylamino]-4-quinolones. An Improved Preparation of Intermediates for Novel Potent Tricyclic Quinolone Antibacterial Agents
作者:David Barrett、Hiroshi Sasaki、Takayoshi Kinoshita、Hideo Tsutsumi、Kazuo Sakane
DOI:10.1246/bcsj.69.1371
日期:1996.5
A new and improved method for the preparation of the key cyclization precursors for novel pyrido[3,2,1-ij]cinnoline antibacterial agents that avoids the use of di-t-butyl methylenemalonate is described. The key process is the alkylation of 1-[N-(hydroxymethyl)-N-methylamino]-4-quinolones with di-t-butyl malonate via the intermediate chloromethyl derivatives. Unexpectedly, this process produced labile
描述了一种新的改进方法,用于制备新型吡啶并 [3,2,1-ij] 肉啉抗菌剂的关键环化前体,避免使用二叔丁基亚甲基丙二酸酯。关键过程是通过中间体氯甲基衍生物将 1-[N-(羟甲基)-N-甲基氨基]-4-喹诺酮类与丙二酸二叔丁酯烷基化。出乎意料的是,该过程产生了不稳定的吡唑并 [1,5-a] 喹啉衍生物,这些衍生物随后会开环并环化成 C8,从而产生吡啶并 [3,2,1-ij] 肉啉关键中间体。