High yield acyl anion trapping reactions: direct nucleophilic acylation of isocyanates and isothiocyanates.
作者:Dietmar Seyferth、Richard C. Hui
DOI:10.1016/s0040-4039(01)81576-8
日期:——
The reactions of t-BuLi, sec-BuLi and n-BuLi with CO in the presence of isothiocyanates and isocyanates gives, after hydrolytic work-up, α-oxothioamides, RC(O)C(S)NHR′, and α-oxoamides, RC(O)C(O)NHR′, respectively, in good yield. Competition from the direct reaction of RLi with the substrate is encountered only in the case of reactions of the n-BuLi/CO system with isocyanates.
在异硫氰酸酯和异氰酸酯的存在下,t-BuLi,sec-BuLi和n-BuLi与CO的反应在水解后处理后得到α-氧代硫代酰胺,RC(O)C(S)NHR'和α-氧代酰胺,RC(O)C(O)NHR'的收率很高。仅在n-BuLi / CO系统与异氰酸酯反应的情况下,才会遇到RLi与底物直接反应的竞争。