An efficient diastereoselective approach for the synthesis of functionalized 3,4-dihydro-2H-pyran-4-carboxamides with variable frame was developed based on the reaction of available 4-oxoalkane-1,1,2,2-tetracarbonitriles (adducts of TCNE and ketones) with aldehydes in an acidic media. An unusual process of quasi hydrolysis of the cyano group was observed in the course of the described regio- and diastereoselective transformation.
开发了一种高效的对映选择性方法,用于合成具有可变结构的官能化3,4-二氢-2H-
吡喷酸-4-酰胺,该方法基于在酸性介质中使用可获得的4-氧代烷基-1,1,2,2-四
氰基
乙烷(TCNE和酮的加合物)与醛的反应。在所描述的区域选择性和对映选择性转化过程中观察到了
氰基的准
水解异常过程。