Catalytic Dehydrogenative Borylation of Terminal Alkynes by a SiNN Pincer Complex of Iridium
作者:Chun-I Lee、Jia Zhou、Oleg V. Ozerov
DOI:10.1021/ja311682c
日期:2013.3.6
catalytic dehydrogenative borylation of carbon-hydrogen bonds with dialkoxyboranes (RO)2BH is particularly attractive. It has been demonstrated for a variety of carbon-hydrogen bond types but not for the C(sp)-H bonds of terminal alkynes, for which hydroboration of the triple bond is a competing process. We report a new iridium catalyst that is strictly chemoselective for C-H borylation of terminal alkynes
具有碳硼键的化合物是通用中间体,可通过将碳硼键加工成其他碳元素键来构建更复杂的分子。通过碳-氢键与二烷氧基硼烷 (RO)2BH 的催化脱氢硼酸化合成碳-硼键特别有吸引力。它已被证明适用于各种碳氢键类型,但不适用于末端炔烃的 C(sp)-H 键,因此三键的硼氢化是一个竞争过程。我们报告了一种新的铱催化剂,它对末端炔烃的 CH 硼酸化具有严格的化学选择性。这种催化剂成功的关键似乎是新的辅助 SiNN 钳配体,它结合了酰胺基、喹啉和甲硅烷基供体,并产生结构上不寻常的 Ir 配合物。