New methods and reagents in organic synthesis. 17. Trimethylsilyldiazomethane(TMSCHN2) as a stable and safe substitute for hazardous diazomethane. Its application to the arndt-eistert synthesis.
作者:TOYOHIKO AOYAMA、TAKAYUKI SHIOIRI
DOI:10.1248/cpb.29.3249
日期:——
Although diazomethane is used in the Arndt-Eistert synthesis, it is both highly toxic and also explosive, and hence should be very carefully handled. In place of this hazardous diazomethane, stable and safe trimethylsilyldiazomethane (TMSCHN2) was found to be very useful for the Arndt-Eistert synthesis. TMSCHN2 was easily acylated with a carboxylic acid chloride in tetrahydrofuran-acetonitrile, and thermal treatment of the acylated product in benzyl alcohol and 2, 4, 6-trimethylpyridine smoothly gave the benzyl ester of a homologated acid. Nucleophiles other than benzyl alcohol could also be used. TMSCHN2 may also be able to replace diazomethane in other areas of chemistry.
尽管偶氮甲烷在阿恩特-艾斯特合成中使用,但它具有高毒性和爆炸性,因此应该非常小心地处理。为了替代这种危险的偶氮甲烷,稳定且安全的三甲基硅烷偶氮甲烷(TMSCHN₂)被发现对于阿恩特-艾斯特合成非常有用。TMSCHN₂可以在四氢呋喃-乙腈中与卤代羧酸酰氯轻松进行酰化,酰化产物在苄醇和2,4,6-三甲基吡啶中的热处理顺利得到了一种同 homologated acid 的苄酯。除了苄醇之外,其他亲核试剂也可以使用。TMSCHN₂可能还能够替代偶氮甲烷在其他化学领域的应用。