作者:Marc Van Den Bril、Robert Fuks
DOI:10.1016/s0040-4020(01)92362-2
日期:1981.1
classical methods. However, it is demonstrated that the general N,N'-substituted-amidine synthesis via the nitrilium salts can also apply to nitrile compounds having an alkoxygroup present on the molecule (method B). Since the cyanoethylation of alcohols (4) is a very fast and facile reaction the method B is the preferred strategy for the synthesis of 3-alkoxy-N,N'-substituted-propanamidines 3.
醇的amidinoethylation通过加入醇钠的发生2(R 1 =甲基,乙基),以各种N,所述CC双键N'-取代的propenamidines 1(方法A)。这说明了共轭am官能团对CC双键的活化作用,为醇提供了一类新的迈克尔受体。但是,这种活化作用比其他亲核试剂或迈克尔受体的活化作用差。mid基乙基化制得的3-烷氧基-N,N'-取代idine可通过其他传统方法轻易获得。然而,已经证明,经由腈盐的一般的N,N′-取代的synthesis合成也可以适用于在分子上具有烷氧基的腈化合物(方法B)。由于醇(4)的氰基乙基化反应非常快速且简便,因此方法B是合成3-烷氧基-N,N'-取代的丙烷3的优选策略。