A ruthenium(II)-catalyzed highly selective Markovnikov hydrogenation of terminal epoxides to secondary alcohols is reported. Diverse substitutions on the aryl ring of styrene oxides are tolerated. Benzylic, glycidyl, and aliphatic epoxides as well as diepoxides also underwent facile hydrogenation to provide secondary alcohols with exclusive selectivity. Metal-ligand cooperation-mediated ruthenium trans-dihydride
Microwave-Assisted Synthesis of Tris-Anderson Polyoxometalates for Facile CO<sub>2</sub> Cycloaddition
作者:Wei-Dong Yu、Yin Zhang、Yu-Yang Han、Bin Li、Sai Shao、Le-Ping Zhang、Hong-Ke Xie、Jun Yan
DOI:10.1021/acs.inorgchem.1c00019
日期:2021.3.15
(NH4)4[ZnMo6O18(C4H8NO3)(OH)3]·4H2O (1), (NH4)4[CuMo6O18(C4H8NO3)(OH)3]·4H2O (2), (TBA)3(NH4)[ZnMo6O17(C5H9O3)2(OH)]·10H2O (3) (TBA = n-C16H36N), and (NH4)4[CuMo6O18(C5H9O3)2]·16H2O (4), were synthesized by a microwave-assisted method. Single-crystal X-ray diffraction revealed that 1 and 2 contained a tris (trihydroxyl organic compounds) ligand grafted on one side, while two tris ligands were grafted on two sides to
四个新的tris-Anderson多金属氧酸盐(POMs)(NH 4)4 [ZnMo 6 O 18(C 4 H 8 NO 3)(OH)3 ]·4H 2 O(1),(NH 4)4 [CuMo 6 O 18(C 4 H 8 NO 3)(OH)3 ]·4H 2 O(2),(TBA)3(NH 4)[ZnMo 6 O 17(C 5 H 9 O 3)2(OH)]·10H 2 O(3)(TBA = n -C 16 H 36 N)和(NH 4)4 [CuMo 6 O 18(C 5 H 9 O 3)2 ]·16H 2 O (4)是通过微波辅助法合成的。X射线单晶衍射表明,1和2的一侧接有一个tris(三羟基有机化合物)配体,而两侧的两个tris配体接枝了,在3和3中形成χ/δ和δ/δ异构体。分别为4。首次获得χ/δ异构体3的1 H和13 C NMR光谱,其中6个亚甲基在1 H NMR光谱中显示6个峰,在13
General and Practical Potassium Methoxide/Disilane-Mediated Dehalogenative Deuteration of (Hetero)Arylhalides
作者:Xin Wang、Ming-Hui Zhu、David P. Schuman、Dayou Zhong、Wen-Yan Wang、Lin-Yang Wu、Wei Liu、Brian M. Stoltz、Wen-Bo Liu
DOI:10.1021/jacs.8b07597
日期:2018.9.5
Herein we describe a general, mild and scalable method for deuterium incorporation by potassium methoxide/hexamethyldisilane-mediated dehalogenation of arylhalides. With CD3CN as a deuterium source, a wide array of heteroarenes prevalent in pharmaceuticals and bearing diverse functional groups are labeled with excellent deuterium incorporation (>60 examples). The ipso-selectivity of this method provides
在此,我们描述了一种通过甲醇钾/六甲基乙硅烷介导的芳基卤化物脱卤来掺入氘的通用、温和且可扩展的方法。以 CD3CN 作为氘源,广泛存在于药物中并具有不同官能团的杂芳烃被标记为具有优异的氘掺入(> 60 个例子)。这种方法的 ipso 选择性提供了对氘代吲哚和喹啉库的精确访问。我们方法的合成效用已通过将氘掺入复杂的天然和类药物化合物中得到证明。
We describe a cerium‐catalyzed aerobic oxidative ringexpansion for the expedient construction of synthetically challenging macrolactones under visible‐light conditions. Cyanoanthracene has been employed as co‐catalyst to accelerate the turnover of the cerium cycle leading to a fast conversion within 20 min of irradiation. Taking advantage of the high efficiency and operationally simple conditions