Lithium Naphthalenide-Induced Reductive Alkylation and Addition of Aryl- and Heteroaryl- Substituted Dialkylacetonitriles
作者:Hsing-Jang Liu、Jia-Liang Zhu、Jing-Po Tsao、Ting-Yueh Tsai、I-Chia Chen、Sheng-Wei Tsao
DOI:10.1055/s-0030-1258301
日期:2010.12
desired reductive alkylation of 2-thienyldialkylacetonitriles, a much lower temperature such as -100 ˚C was required. Also with these substrates, an interesting ring-opening/S-alkylation process was observed when the reductive alkylation were performed at -78 ˚C to give 1-alkylsulfanyl-1,3,4-trienes. A mechanistic discussion is given for this observation. reductive alkylation - reductive addition - reductive
研究了萘锂(LN)诱导的芳基,吡啶基和2-噻吩基取代的二烷基乙腈的还原烷基化/加成反应。在-40°C的THF中用LN处理后,芳基和吡啶基前体均可顺利进行还原性脱氰作用,并且原位生成的碳负离子很容易被卤代烷,酮,醛或什至氧气捕获,从而提供了宽范围带有新建立的季碳的官能化芳族衍生物的制备 为了实现所需的2-噻吩基二烷基乙腈的还原性烷基化反应,需要低得多的温度,例如-100°C。同样在这些底物上,当在-78°C下进行还原烷基化反应时,观察到有趣的开环/ S-烷基化过程,得到1-烷基硫烷基-1,3,4-三烯。 还原烷基化-还原加成-还原脱氰-腈-萘锂-芳基衍生物-杂芳基衍生物-取代的1,3,4-三烯