A scandium trifluoromethanesulfonate-catalyzed reaction of donor–acceptor cyclopropanes with 6-amino-1,3-dimethyluracil was found to proceed as three-membered ring opening via nucleophilic attack of the C(5) atom of an ambident nucleophile serving as an enamine equivalent. It was shown that, under basic conditions, the obtained products underwent cyclization to 6,7-dihydro-1H-pyrimido[4,5-b]azepine-2
发现
三氟甲磺酸钪催化的供体-受体
环丙烷与 6-
氨基-1,3-二甲基尿
嘧啶的反应作为三元环开环进行,通过亲核攻击作为烯胺等价物的环境亲核试剂的 C(5) 原子. 结果表明,在碱性条件下,所得产物环化为 6,7-dihydro-1 H -pyrimido [4,5 - b ]azepine-2,4,8-triones,这是一个有趣的核碱基类似物亚类。