Nickel- and Cobalt-Catalyzed Direct Alkylation of Azoles with N-Tosylhydrazones Bearing Unactivated Alkyl Groups
作者:Tomoyuki Yao、Koji Hirano、Tetsuya Satoh、Masahiro Miura
DOI:10.1002/anie.201106825
日期:2012.1.16
A matter of catalyst: Azole compounds can be directly alkylated with N‐tosylhydrazones that bear unactivated alkyl groups (see scheme; phen=1,10‐phenanthroline, Ts=p‐toluenesulfonyl). Nickel catalysis enables the introduction of simple secondary alkyl chains into benzoxazole compounds, whereas the alkylation of 5‐aryloxazoles and benzothiazole is possible by using a cobalt catalyst.
催化剂问题:腈化合物可以直接与带有未活化烷基的N-甲苯磺酰hydr烷基化(见方案; phen = 1,10-菲咯啉,Ts =对甲苯磺酰基)。镍催化可将简单的仲烷基链引入苯并恶唑化合物,而5-芳基恶唑和苯并噻唑的烷基化可通过使用钴催化剂来实现。