A route to ortho-substituted benzyne precursors by deprotonation of 7-methyl-1-aminobenzotriazole derivatives
作者:Michael A. Birkett、David W. Knight、Michael B. Mitchell
DOI:10.1016/s0040-4039(00)91835-5
日期:1993.10
obenzotriazole 6 using nBuLi-TMEDA-THF [−78°C - > 0°C] results in an essentially quantitative conversion to the dianionic intermediate 7. Trapping at the carbon-centred anion occurs selectively under suitable conditions with alkylating agents, aldehydes and ketones to give good to excellent yields of the 7-substituted-1-aminobenzotriazoles 8–15, precursors of -substituted benzynes.
使用n BuLi-TMEDA-THF [-78°C-> 0°C]对-Boc-7-甲基-1-氨基苯并三唑6进行双去质子化,导致基本上定量转化为双阴离子中间体7。在碳中心阴离子上的截留在合适的条件下与烷基化剂,醛和酮选择性地发生,从而使7取代的1-氨基苯并三唑8-15(取代的苯并炔的前体)的收率达到良好至极佳的水平。