The invention provides a method of preparing compound of formula (iv),
by contacting the compound of formula (iii) with R1NH2 in the presence of a base or a Lewis acid, in a solvent as defined herewith. The invention further provides a compound of formula (iii),
and tautomers thereof, wherein R2 is substituted or unsubstituted C1-8 alkyl, or substituted saturated cycloalkyl as defined herein.
本发明提供了一种制备式 (iv) 化合物的方法、
在碱或
路易斯酸存在下,在如本文所定义的溶剂中将式 (iii) 化合物与 R1NH2 接触。本发明进一步提供了一种式(iii)化合物、
及其同系物,其中 R2 是本文定义的取代或未取代的 C1-8 烷基或取代的饱和环烷基。