<i>Z</i>
‐Selective α‐Arylation of α,β‐Unsaturated Nitriles via [3,3]‐Sigmatropic Rearrangement
作者:Mengyuan Chen、Yuchen Liang、Taotao Dong、Weijian Liang、Yanping Liu、Yage Zhang、Xin Huang、Lichun Kong、Zhi‐Xiang Wang、Bo Peng
DOI:10.1002/anie.202010740
日期:2021.2
The Morita‐Baylis–Hillman (MBH) reaction and [3, 3]‐sigmatropic rearrangement are two paradigms in organic synthesis. We have merged the two types of reactions to achieve [3,3]‐rearrangement of aryl sulfoxides with α,β‐unsaturated nitriles. The reaction was achieved by sequentially treating both coupling partners with electrophilic activator (Tf2O) and base, offering an effective approach to prepare
Morita-Baylis-Hillman(MBH)反应和[3,3]-σ重排是有机合成的两个范例。我们将两种类型的反应合并在一起,以实现[3,3]-芳基亚砜与α,β-不饱和腈的重排。该反应是通过依次用亲电子活化剂(Tf 2 O)和碱处理两个偶合伙伴而实现的,提供了一种有效的方法,可通过直接的α-C-H芳基化制备具有Z-选择性的合成型多功能α-芳基α,β-不饱和腈未改性的α,β-不饱和腈 控制实验和DFT计算支持四个阶段的反应序列,包括Tf 2的组装O活化的芳基亚砜,具有α,β-不饱和腈,类似MBH的Lewis碱,[3,3]-重排和E1cB-消除。在这些阶段中,路易斯碱的加成是非对映选择性的,而E1cB-消除是顺式选择性的,这可能说明了反应的显着Z选择性。