Synthesis of Acyclic Aliphatic Amides with Contiguous Stereogenic Centers via Palladium‐Catalyzed Enantio‐, Chemo‐ and Diastereoselective Methylene C(sp
<sup>3</sup>
)−H arylation
作者:Ye‐Qiang Han、Xu Yang、Ke‐Xin Kong、Yao‐Ting Deng、Le‐Song Wu、Yi Ding、Bing‐Feng Shi
DOI:10.1002/ange.202008952
日期:2020.11.9
asymmetric arylation of unbiased methylene C(sp3)−H, in good yields and with high levels of enantio‐, chemo‐ and diastereoselectivity (up to >99 % ee and >20:1 d.r.). Successive application of this method enables the sequential arylation of the gem‐dialkyl groups with two different aryl iodides, giving a range of β‐Ar1‐β′‐Ar2‐aliphatic acyclic amides containing three contiguous stereogenic centers with excellent
摘要α-的对映选择性去对称 C−H 激活宝石‐二烷基无环酰胺仍然具有挑战性,因为四个化学性质相同的无偏亚甲基 C(sp3)−H 键和无环系统增加的旋转自由度给化学和立体控制增加了巨大的困难。我们开发了一种通过 Pd 合成具有 α,β-连续立体中心的无环脂肪酰胺的方法二‐催化无偏亚甲基C(sp3)−H,收率良好,具有高水平的对映选择性、化学选择性和非对映选择性(高达 >99 %伊和 >20:1 dr)。该方法的连续应用使得能够顺序芳基化宝石-二烷基与两种不同的芳基碘化物,给出一系列 β-Ar1-β′-Ar2‐含有三个连续立体中心的脂肪族无环酰胺,具有优异的非对映选择性。