Gold-Catalyzed Oxidative Arylations of 3-Butyn-1-ols and 2-Propyn-1-ols with Nitrones to Yield Distinct Fused Indoles Bearing a Heterocyclic Ring
作者:Rajkumar Lalji Sahani、Rai-Shung Liu
DOI:10.1021/acscatal.9b01491
日期:2019.7.5
The catalytic formation of various fused indoles from the nitrone oxidations of 1-substituted n-yn-1-ols (n = 2, 3) is described. For 3-butyn-1-ols, the oxidations yield tetrahydropyrano[4,3-b]indoles, whereas 2-propynols deliver tetrahydro-[1,2]oxazino[5,4-b]indoles efficiently. When styryl nitrones were tested on 2-propyn-1-ols, dihydrooxazolo[3,4-a]indoles were produced efficiently. We postulate
描述了由1-取代的n -yn-1-ols(n = 2,3)的硝酮氧化催化形成各种稠合吲哚的方法。对于3-丁炔-1-醇,氧化产生四氢吡喃并[4,3- b ]吲哚,而2-丙炔醇有效地递送四氢-[1,2]恶嗪基[5,4- b ]吲哚。当在2-丙炔-1-醇上测试苯乙烯基硝酮时,可以高效地生产二氢恶唑并[3,4- a ]吲哚。我们假定这些稠合的吲哚的形成是由共同的机理引起的,该机制涉及在这些稠合的吲哚之前,初始的烯基金中间体的[3,3]-σ位移以提供羰基化作用。