Morita–Baylis–Hillman‐Type [3,3]‐Rearrangement: Switching from
<i>Z</i>
‐ to
<i>E</i>
‐Selective α‐Arylation by New Rearrangement Partners
作者:Lei Zhang、Wangzhen Bao、Yuchen Liang、Wenjing Pan、Dongyang Li、Lichun Kong、Zhi‐Xiang Wang、Bo Peng
DOI:10.1002/anie.202100497
日期:2021.5.10
α‐aryl α,β‐unsaturated carbonyls represent an important class of derivatizable synthetic intermediates, however, the synthesis of such compounds still remains a challenge. Recently, we showcased a novel Z‐selective α‐arylation of α,β‐unsaturated nitriles with aryl sulfoxides via [3,3]‐rearrangement involving an Morita–Baylis–Hillman (MBH) process. Herein, we demonstrate the feasibility of reversing
α-芳基α,β-不饱和羰基代表了一类重要的可衍生合成中间体,但是,这类化合物的合成仍然是一个挑战。最近,我们通过涉及Morita-Baylis-Hillman(MBH)过程的[3,3]重排展示了α,β-不饱和腈与芳基亚砜的新型Z选择性α-芳基化。在本文中,我们证明了通过切换到一对新的由芳基碘酮和α,β-不饱和恶唑啉组成的重排配偶体来逆转此类MBH型[3,3]-重排的立体选择性的可行性。结果,这两个协议在接近E或Z时相互补充-α-芳基α,β-不饱和羰基衍生物。机理研究揭示了可能的反应途径,并为相反的立体选择性提供了解释。