Regioselective and Enantioselective Addition of Sulfur Nucleophiles to Acyclic α,β,γ,δ-Unsaturated Dienones Catalyzed by an Iron(III)–Salen Complex
作者:Subrata Shaw、James D. White
DOI:10.1021/acs.orglett.5b02280
日期:2015.9.18
The first regioselective, enantioselective conjugate addition of thiols to acyclic α,β,γ,δ-unsaturated dienones at the δ carbon is described. The reaction, catalyzed by a chiral iron(III)-salen complex derived from cis-2,5-diaminobicyclo[2.2.2]octane as the scaffold, provides δ-thia-α,β-unsaturated ketones in high yield and enantioselectivity. The bicyclooctane scaffold of (2R,3R,5R,6R) configuration
描述了在δ碳处硫醇向无环α,β,γ,δ-不饱和二烯酮的第一次区域选择性,对映选择性共轭加成。以顺式-2,5-二氨基双环[2.2.2]辛烷为骨架的手性铁(III)-salen配合物催化该反应,可高产率和对映选择性地提供δ-thia-α,β-不饱和酮。(2所述的二环支架- [R,3 - [R,5 - [R,6 - [R )构型,得到一δ硫杂-α,(的β不饱和酮- [R )构型,这表明硫亲核试剂是在引入SI的γ的面,δ-双键。提出了一个为这种区域选择和立体选择提供解释的模型。