A general synthesis of 1-(1-alkenyl)benzotriazoles
摘要:
1-Methyl, 1-(alkoxymethyl) and 1-(trimethylsilylmethyl)benzotriazoles are metallated at the alpha-carbon. Trapping of the resulting metallated species with chlorotrimethylsilane gives compounds which undergo Peterson olefination even with hindered ketones. In some cases, metallation at the 4-position of the benzotriazole is observed. An exhaustive metallation/silylation sequence gives 4-trimethylsilyl substituted 1-benzotriazoles in good yields. (C) 1999 Published by Elsevier Science Ltd. All rights reserved.
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