Bifunctional Brønsted Base Catalyst Enables Regio-, Diastereo-, and Enantioselective C<sub>α</sub>-Alkylation of β-Tetralones and Related Aromatic-Ring-Fused Cycloalkanones
作者:Iñaki Urruzuno、Odei Mugica、Mikel Oiarbide、Claudio Palomo
DOI:10.1002/anie.201612332
日期:2017.2.13
The catalytic asymmetric synthesis of both α‐substituted and α,α‐disubstituted (quaternary) β‐tetralones through direct α‐functionalization of the corresponding β‐tetralone precursor remains elusive. A designed Brønsted base‐squaramide bifunctional catalyst promotes the conjugate addition of either unsubstituted or α‐monosubstituted β‐tetralones to nitroalkenes. Under these reaction conditions, not
通过相应的β-四氢萘酮前体的直接α-官能化,α-取代的和α,α-二取代的(季)β-四氢萘酮的催化不对称合成仍然难以捉摸。设计的布朗斯台德碱-方酰胺双功能催化剂可促进未取代的或α-单取代的β-四氢萘酮与硝基烯烃的共轭加成反应。在这些反应条件下,不仅烯醇化和官能化仅在β-四氢萘酮的α-碳原子上发生,而且包括全碳四元中心的加合物也以高度非对映和对映选择性的方式形成。