Having previously established that 1,3-diones could be used as nucleophiles to perform additions to ynamides, highly selective hydroalkoxylation of internal ynamides is now described herein. Several catalytic systems were compared to carry out this transformation including transition metal-based catalysts or Lewis acids. ZnI2 was found to be both very active and highly selective giving only E adducts through a syn addition. Scope and limits investigation showed that this catalyst was compatible with various functional groups. In addition to 17 examples of ynamide hydroalkoxylation, one example of ynamide hydroarylation is reported.

中文翻译：

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1,3-二酮对碘化锌催化的内炔酰胺的高选择性顺式加成

先前已确定 1,3-二酮可用作亲核试剂以对 ynamides 进行加成，现在在此描述内部 ynamides 的高度选择性加氢烷氧基化。比较了几种催化系统来进行这种转化，包括基于过渡金属的催化剂或路易斯酸。发现 ZnI2 既非常活跃又具有高度选择性，通过顺式加成仅产生 E 加合物。范围和限制调查表明该催化剂与各种官能团相容。除了 ynamide 加氢烷氧基化的 17 个实例外，还报道了一个 ynamide 加氢芳基化的实例。