Unprecedented Oxycyanation of Methylenecyclopropanes for the Facile Synthesis of Benzoxazine Compounds Containing a Cyano Group
作者:Yu-Chao Yuan、Hai-Bin Yang、Xiang-Ying Tang、Yin Wei、Min Shi
DOI:10.1002/chem.201505224
日期:2016.4.4
novel intramolecular oxycyanation of methylenecyclopropanes is reported that proceeds through oxidative cleavage of the N−CN bond and subsequent palladium transfer from N to O of the amide group. A range of substituted benzo[d][1,3]oxazines with a cyano group are readily furnished by this newly developed oxycyanation reaction. Tris(4‐trifluoromethylphenyl)phosphine as a ligand has been found to be crucial
据报道,一种新的亚甲基环丙烷分子内的氧氰化作用是通过N-CN键的氧化裂解以及随后的钯从酰胺基团的N到O的转移而进行的。通过该新开发的氧氰化反应,可以容易地提供一系列具有氰基的取代的苯并[ d ] [1,3]恶嗪。已发现三(4-三氟甲基苯基)膦作为配体对于以高化学和区域选择性有效促进转化至关重要。而且,反应结果会受到与亚甲基环丙烷的氮原子连接的酰基的电子效应的显着影响。当R 3为氯甲基时,吡咯并[2,3- b通过热诱导亚甲基环丙烷的[3 + 2]环加成反应生成甲烷二亚胺中间体,可以得到]喹啉衍生物。