Use of dilithio-tosylmethyl isocyanide in the synthesis of oxazoles and imidazoles
作者:Simon P.J.M. van Nispen、Cees Mensink、Albert M. van Leusen
DOI:10.1016/s0040-4039(00)78757-0
日期:1980.1
Dilithio-tosylmethyl isocyanide () reacts with the carbonyl of unsaturated esters to form oxazoles, unlike tosylmethyl isocyano monoanion which gives pyrroles by reaction with the conjugated carbon-carbon double bonds. Reaction of with carbon-nitrogen multiple bonds leads to imidazoles, an example of which is the one-step synthesis of imidazo[5,1-a]isoquinoline from isoquinoline. From and pyridine-N-oxide
二
甲苯硫代
甲苯磺酰基甲基异
氰化物与不饱和酯的羰基反应形成
恶唑,而
甲苯磺酰基甲基异
氰基单阴离子则通过与共轭碳-碳双键反应生成
吡咯。与碳-氮多键的反应产生
咪唑,其实例是由
异喹啉一步合成
咪唑并[5,1-a]
异喹啉。由此得到
吡啶-N-氧化物或
哒嗪-N-氧化物不饱和开环产物。