作者:Gwendolyn K. Cook、John H. McDonald、William Alborn、Donald B. Boyd、Judy A. Eudaly、Joseph M. Indelicato、Rod Johnson、Jeffrey S. Kasher、Carol E. Pasini
DOI:10.1021/jm00131a006
日期:1989.11
with or without warning to 50 degrees C. Bases nucleophilic enough to displace the triflate include a variety of substituted pyridines and N-methylimidazole. Deprotection then produced a very active series of 1-[7 beta-[(2-amino- 4-thiazolyl)(methoxyimino)acetyl]amino]-2-carboxy-8-oxo- 1-azabicyclo[4.2.0]oct-2-en-3-yl] quaternary ammonium hydroxide inner salts. These compounds were extremely potent antibacterials
描述了一系列结构独特的1-carba-1-dethiacephems。1-carba-1-dethiacephem核的结构稳定性对于制备该系列的3-季铵碳萘啶是至关重要的。已知的对硝基苄基7β-(苯氧基乙酰胺基)-3-[[(三氟甲基)磺酰基]氧基] -1-carba-1-dethia-3-cephem-4-羧酸酯既用作季铵化底物,又用作前体衍生物,例如烯丙基7β-[[[2- [烯丙基氧基]羰基]氨基-4-噻唑基] [(甲氧基亚氨基)乙酰基]氨基] -3-[((三氟甲基)磺酰基]氧] -1-碳-1-1-硫醇-3 -cephem-4-羧酸盐。这些烯醇三氟甲磺酸酯的季铵化反应可通过溶解在含有碱的乙腈中或通过溶解在碱中来实现,无论是否警告到50摄氏度。足以取代三氟甲磺酸酯的亲核碱基包括各种取代的吡啶和N-甲基咪唑。然后脱保护产生了一系列非常活跃的1- [7β-[(2-氨基-4-噻唑基)(甲氧基亚氨基)乙酰基]氨基]