Synthesis of Amido Esters and Amido Phosphonates through Carbonylation of Diazo Compounds Followed by Nucleophilic Addition Reaction
作者:Kankanala Ramakrishna、Chinnappan Sivasankar
DOI:10.1002/ejoc.201700581
日期:2017.7.25
We report a method to produce amido esters and amido phosphonates. Octacarbonyldicobalt [Co2(CO)8] was found to be an efficient nongaseous CO source that could be used as a reagent for the carbonylation of diazo esters and diazo phosphonates under mild reaction conditions. A number of diazo esters and diazo phosphonates smoothly underwent the reaction with CO, which was generated from Co2(CO)8, to
我们报告了一种生产酰氨基酯和酰氨基膦酸酯的方法。发现八羰基二钴 [Co2(CO)8] 是一种有效的非气态 CO 源,可用作在温和反应条件下重氮酯和重氮膦酸酯羰基化的试剂。许多重氮酯和重氮膦酸酯顺利地与由 Co2(CO)8 生成的 CO 反应,生成相应的烯酮。随后与胺反应得到预期的酰氨基酯和膦酸酯。通过应用开发的协议,我们合成了许多酰胺酯和酰胺膦酸酯。这些化合物的表征是通过使用标准光谱和分析技术以及对四种产品的晶体结构分析来实现的。
A Novel Approach to Substituted α-Carbamoyl Phosphonates: Useful Reagents for the Horner–Wadsworth–Emmons Olefination
α-Carbamoyl phosphonates are useful reagents for the Horner–Wadsworth–Emmonsolefination of aldehydes en route to medicinally relevant polysubstituted acrylamides. A new synthetic approach to these reagents has been developed. The methodology relies on the microwave-promoted Wolff rearrangement of α-acyl-α-diazophosphonates with trapping of the ketene intermediate in situ with various amines.
Ketenimines bearing electron-withdrawing groups (X in 1) at the C2-position react with lithium trimethylsilyldiazomethanide [diazo(lithio) trimethylsilylmethane] to give 4-amino-3-trimethylsilylpyrazoles 4 or 5 mainly; in some cases 4-trimethylsilyl-1,2,3-triazole derivatives 3 were formed as the major products.