Stereoselective Synthesis of Tetrasubstituted Alkenes via a Cp*Co
<sup>III</sup>
‐Catalyzed C−H Alkenylation/Directing Group Migration Sequence
作者:Hideya Ikemoto、Ryo Tanaka、Ken Sakata、Motomu Kanai、Tatsuhiko Yoshino、Shigeki Matsunaga
DOI:10.1002/anie.201703193
日期:2017.6.12
economical and stereoselective synthesis of tetrasubstituted α,β‐unsaturated amides was achieved by a Cp*CoIII‐catalyzed C−H alkenylation/directing group migration sequence. A carbamoyl directing group, which is typically removed after C−H functionalization, worked as an internal acylating agent and migrated onto the alkene moiety of the product. The directing group migration was realized with the
通过Cp * Co III催化的CH烯基化/方向基团迁移序列,实现了高度原子经济和立体选择性的四取代α,β-不饱和酰胺的合成。通常在CH官能化后被除去的氨基甲酰基导向基团作为内部酰化剂起作用,并迁移到产物的烯烃部分上。使用Cp * Co III催化剂可实现导向基团的迁移,而相关的Cp * Rh III催化剂则不会促进迁移过程。将产物进一步转化为两种类型的三环化合物,其中一种具有荧光性质。