Novel metallation of benzotriazoles and its utility in the synthesis of 4-substituted oxindoles
作者:David P.M. Pleynet、Jonathan K. Dutton、M. Thornton-Pett、A.Peter Johnson
DOI:10.1016/0040-4039(95)01221-3
日期:1995.8
Repeated metallation/silylation of 1-methoxymethylbenzotriazole 1 gives a high yield of the 4-tristrimethylsilyl benzotriazole derivative 5 which undergoes a high yielding fluoride-catalysed Peterson olefination reaction to give 1-(4-trimethylsilylbenzotriazolyl)-methoxymethylene adamantane 6b. Photolysis of 6b affords a remarkably strained iminoether 7b which can easily be converted to the corresponding
Synthesis of hindered spiro-oxindoles by photolysis of 1-(1-alkenyl)benzotriazoles
作者:Jonathan K. Dutton、David P.M. Pleynet、A.Peter Johnson
DOI:10.1016/s0040-4020(99)00691-2
日期:1999.10
Photolysis of 1-(1-alkoxy-1-alkenyl)benzotriazoles gives moderate yields of 2-alkoxy-indolenines, which can be hydrolysed to oxindoles. A side reaction leads to the formation of imino-oxetanes. The formation of the 2-alkoxy-indolenines is quite insensitive to steric hindrance at the reacting centres.