作者:Sigvart Evjen、Anne Fiksdahl
DOI:10.1016/j.tet.2016.04.058
日期:2016.6
the understanding of the gold(I) catalysis chemistry of propargyl acetals, a gold(I) catalysed [3+3] cycloaddition reaction of propargyl acetals with nitrones has been studied. A series of 5-methoxy-3,6-dihydro-2H-1,2-oxazine products with two stereogenic centres were obtained in a cis-stereoselective manner. The formal [3+3] cycloaddition reaction is supposed to go through O-nucleophilic attack of
在我们的一系列研究中,为加深对炔丙基缩醛的金(I)催化化学的理解,研究了金(I)催化的炔丙基缩醛与硝酮的[3 + 3]环加成反应。以顺式-立体选择性的方式获得了具有两个立体生成中心的一系列5-甲氧基-3,6-二氢-2 H -1,2-恶嗪产物。正式的[3 + 3]环加成反应应该经过硝酮对C的O-亲核攻击由炔丙基缩醛产生的金络合物的1位,随后进行最终的闭环。硝酮的另一种C3氧化作用可提供醛产物,并且代表了竞争途径。为了证明反应的潜力和局限性,讨论了环加成反应的化学选择性。