Catalytic Enantioselective Synthesis of <i>C</i>
<sub>1</sub>
- and <i>C</i>
<sub>2</sub>
-Symmetric Spirobiindanones through Counterion-Directed Enolate <i>C</i>
-Acylation
作者:Benjamin F. Rahemtulla、Hugh F. Clark、Martin D. Smith
DOI:10.1002/anie.201607731
日期:2016.10.10
A catalytic enantioselective route to C1 - and C2 -symmetric 2,2'-spirobiindanones has been realized through an intramolecular enolate C-acylation. This reaction employs a chiral ammonium counterion to direct the acylation of an in situ generated ketone enolate with a pentafluorophenyl ester. This reaction constitutes the first example of a direct catalytic enantioselective C-acylation of a ketone and
通过分子内烯醇化物C-酰化已经实现了对C 1-和C 2-对称的2,2'-螺双茚满酮的催化对映选择性路线。该反应采用手性铵抗衡离子来指导原位产生的酮烯酸酯与五氟苯基酯的酰化。该反应构成了酮的直接催化对映选择性C-酰化的第一个实例,并提供了一种高效且高度对映选择性的途径来制备轴向手性螺双二茚二酮。这些产品可以非对映选择性地衍生化,从而可以使用一系列功能化的螺环结构。