A Convenient Synthesis of 9H-Thioxanthen-9-ones and Their Aza-Analogues
摘要:
An efficient method for the preparation of 9H-thioxanthen-9-ones and their three aza-analogues has been developed. The reaction of (2-fluorophenyl)(2-halophenyl)methanones, derived from 1-bromo-2-fluorobenzenes and 2-halobenzaldehydes by an easy two-step sequence, with Na2S center dot 9H(2)O in DMF at 60 degrees C gives 9H-thioxanthen-9-ones. This procedure can be applied to the synthesis of 5H-[1]benzothiopyrano[2,3-b] (or [2,3-c])pyridin-5-ones or 10H-[1]benzothiopyrano[3,2-c]pyridin-10-ones starting from 2-, 3- or 4-chloropyridines, respectively.
Pyrido[4,3‐e]‐1,4‐diazepines and fused tricyclic analogs thereof have been synthesized and tested for inhibition of benzodiazepine binding to receptors in various rat brain structures in comparison with standard drugs. Structure‐affinity relationships are discussed.