Construction of 2-Substituted-3-Functionalized Benzofurans via Intramolecular Heck Coupling: Application to Enantioselective Total Synthesis of Daphnodorin B
A novel approach was developed for the synthesis of 2-substituted-3-functionalized benzofurans, using an intramolecular Heckreaction which was further applied in the first enantioselectivetotalsynthesis of Daphnodorin B.
An efficient and operationally simple procedure using Pd/BaSO4-catalyzed cross coupling of acyl chlorides with in situ generated alkynylzinc derivatives was developed, giving the corresponding ynones at yields of 50%–96%.
A mild and operationally simple procedure by Pd-catalyzed cross-coupling of acyl chlorides with in situ-generated alkynylzinc derivatives was developed, giving the corresponding ynones in good yields. Supplementary materials are available for this article. Go to the publisher's online edition of Synthetic Communications (R) full experimental and spectral details.
Synthesis of 1-Substituted Cyclopropylamines via Formal Tertiary C<sub>sp<sup>3</sup></sub>–H Amination of Cyclopropanes
作者:Kui Liu、Shao-Jie Cheng、Gen Luo、Zhi-Shi Ye
DOI:10.1021/acs.orglett.1c03687
日期:2021.12.3
A novel and facile approach to synthesis of 1-substituted cyclopropylamines via phosphine-catalyzed formal tertiary Csp3–H amination of cyclopropanes was described. The indoles, pyrroles, imidazoles, uracils, 2-pyridone, pyrimidin-4(3H)-one, and phthalimide had been proven as good aminating partners. The present protocol features transition-metal-free, excellent regioselectivity, high-atom-economy
描述了一种通过膦催化环丙烷的形式叔 C sp 3 -H 胺化合成 1-取代环丙胺的新方法。吲哚类、吡咯类、咪唑类、尿嘧啶类、2-吡啶酮、pyrimidin-4(3 H)-one,邻苯二甲酰亚胺已被证明是良好的胺化伙伴。本协议具有无过渡金属、优异的区域选择性、高原子经济性、温和的反应条件和广泛的底物。该协议的实用性还可以通过生物活性分子的后期修饰、放大反应和发散衍生化来证明。值得注意的是,该方法已用于激素敏感性脂肪酶 (HSL) 抑制剂的正式合成。通过实验和计算研究阐明了机械方面。
C–C Bond Activation of Cyclopropanes Enabled by Phosphine-Catalyzed <i>In Situ</i> Formation of High-Strain Methylenecycopropane Intermediate
作者:Kui Liu、Gang Wang、Zhe-Wen Zhang、Yu-Yang Shi、Zhi-Shi Ye