Synthesis of substituted nitroolefins: a copper catalyzed nitrodecarboxylation of unsaturated carboxylic acids
作者:Balaji V. Rokade、Kandikere Ramaiah Prabhu
DOI:10.1039/c3ob41408f
日期:——
A novel, mild and convenient method for the nitrodecarboxylation of substituted cinnamic acid derivatives to their nitroolefins is achieved using a catalytic amount of CuCl (10 mol%) and tert-butyl nitrite (2 equiv.) as a nitrating agent in the presence of air. This reaction provides a useful method for the synthesis of β,β-disubstituted nitroolefin derivatives, which are generally difficult to access from other conventional methods. Additionally, this reaction is selective as the E-isomer of the acid derivatives furnishes the corresponding E-nitroolefins. One more salient feature of the method is, unlike other methods, no metal nitrates or HNO3 are employed for the transformation.
使用催化量的CuCl (10 mol%)和特丁基硝酸酯(2 equiv.)作为硝化剂,在空气存在的条件下,实现了一种新颖、温和且便捷的取代肉桂酸衍生物的亚硝基脱羧反应,转化为相应的硝基烯烃。这一反应提供了一种合成β,β-二取代硝基烯烃衍生物的有效方法,这些化合物通常难以通过其他传统方法获得。此外,这一反应具有选择性,酸衍生物的E-异构体能够生成对应的E-硝基烯烃。该方法的另一个显著特点是,与其他方法不同,转化过程中无需使用金属硝酸盐或HNO3。