Morita-Baylis-Hillman Reaction of β,β-Disubstituted Enones: An Enantioselective Organocatalytic Approach for the Synthesis of Cyclopenta[<i>b</i>
]annulated Arenes and Heteroarenes
作者:Bishnupada Satpathi、S. S. V. Ramasastry
DOI:10.1002/anie.201510457
日期:2016.1.26
The first enantioselective organocatalytic intramolecular Morita–Baylis–Hillman (MBH) reaction of sterically highly demanding β,β‐disubstituted enones is presented. The MBH reaction of β,β‐disubstituted‐α,β‐unsaturated electron‐withdrawing systems was previously considered to be unfeasible. Towards this end, designer substrates, which under simple and practical reaction conditions generate a variety
介绍了第一个对映选择性有机催化的分子内Morita-Baylis-Hillman(MBH)反应的高空间要求的β,β-二取代的烯酮。以前认为,β,β-二取代-α,β-不饱和吸电子体系的MBH反应是不可行的。为此,设计者的底物在简单而实际的反应条件下会生成各种环戊基[ b]。描述了在非常短的反应时间内,优异的对映体纯度和近定量收率的环芳烃和杂芳烃。该反应异常容易的性质的原因归因于协同作用指导的和熵有利的分子内反应。另外,该策略提供了容易获得大量生物活性天然产物和药学上重要的化合物的途径。