Mn(III)-Mediated Reactions of Cyclopropanols with Vinyl Azides: Synthesis of Pyridine and 2-Azabicyclo[3.3.1]non-2-en-1-ol Derivatives
作者:Yi-Feng Wang、Shunsuke Chiba
DOI:10.1021/ja905110c
日期:2009.9.9
to the formation of 2-azabicyclo[3.3.1]non-2-en-1-ol derivatives using a catalytic amount of Mn(acac)(3). These reactions may be initiated by a radical addition of beta-keto radicals, generated by the one-electron oxidation of cyclopropanols, to vinyl azides to give iminyl radicals, which would cyclize with the intramolecular carbonyl groups. In addition, versatile transformations of 2-azabicyclo[3.3
Mn(III) 介导的取代吡啶和 2-氮杂双环 [3.3.1] 非 2-en-1-ol 衍生物的发散合成使用容易获得的乙烯基叠氮化物和具有广泛取代基的环丙醇进行开发。简而言之,在 Mn(acac)(3)(1.7 当量)存在下,乙烯基叠氮化物与单环环丙醇反应生成吡啶,而与双环环丙醇反应生成 2-氮杂双环 [3.3.1]non-2 -en-1-ol 衍生物,使用催化量的 Mn(acac)(3)。这些反应可以通过将环丙醇单电子氧化产生的β-酮基自由基加成到乙烯基叠氮化物以产生亚胺基自由基来引发,亚胺基自由基会与分子内羰基环化。此外,2-氮杂双环[3.3.1]non-2-en-1-ol 到 2-氮杂双环[3.3] 的通用转化。