yield and excellent regioselectivity from the combination of aldehydes and ynamides. The enaminone products are subsequently used as a platform to construct a diverse array of substituted pyrazoles, pyrimidines, and isoxazoles in a two-step, one-pot sequence. It was found that with judicious choice of catalyst system it was possible to overturn the regioselectivity of the hydroacylation reaction to
描述了炔酰胺加氢酰化的第一个实例。使用
铑催化,可以通过醛和乙酰胺的组合以高收率和优异的区域选择性生成线性β-烯胺酮产物。随后将烯胺酮产物用作平台,以两步一锅法的顺序构建各种取代的
吡唑,
嘧啶和
异恶唑。发现通过明智地选择催化剂体系,有可能推翻加氢酰化反应的区域选择性以产生α-烯胺酮产物。