A novel and efficient method has been developed for the synthesis of 2‐hydroxybenzoyl‐1H‐pyrazolylphosphonates and dihydrochromeno[3,2‐c]pyrazolylphosphonates by the reaction of 3‐formylchromones/3‐halo‐4H‐chromenones with Bestmann‐Ohira Reagent (BOR) in the presence of RuCl₃ catalyst. The reactions proceeded through decarbonylation, debromination, intramolecular cyclization and N‐methylation to provide the new heterocyclic compounds in one‐pot with the formation of C−C and C−N bonds. The structure assignment of compound 3 f was confirmed by X‐ray analysis.

中文翻译：

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RuCl3催化苯酮与Bestmann-Ohira试剂的反应，可构建2-羟基苯甲酰基-1H-吡唑基膦酸酯和二氢色素[3,2-c]吡唑基膦酸酯

一种新颖和有效的方法已被开发用于的2-羟基苯甲酰基-1-合成ħ -pyrazolylphosphonates和二氢苯并吡喃[3,2- c ^ ] pyrazolylphosphonates通过3- formylchromones反应/ 3-卤代-4- ħ与Bestmann-大平-chromenones在RuCl ₃催化剂存在下的试剂（BOR）。反应通过脱羰，脱溴，分子内环化和N-甲基化进行，以一锅提供具有C C和C N键的新杂环化合物。X射线分析证实了化合物3 f的结构归属。