A novel palladium-catalyzed interannular selective C-H silylation of 1,1'-biaryl-2-acetamides is described. The combination of palladium catalyst with copper oxidant enables meta- or ortho-selective C-H silylation by employing hexamethyldisilane as a trimethylsilyl source, which relies on the control of NBE derivatives as a switch, thus providing straightforward access to divergent silicon-containing 1,1'-biaryl-2-acetamides.
The enantioselective construction of axially chiral compounds by electrophilic carbothiolation of alkynes is disclosed for the first time. This enantioselective transformation is enabled by the use of a Ts-protected bifunctional sulfide catalyst and Ms-protected ortho-alkynylaryl amines (Ts=tosyl; Ms=mesyl). Both electrophilic arylthiolating and electrophilic trifluoromethylthiolating reagents are
首次公开了通过炔的亲电碳硫基化对轴向手性化合物的对映选择性结构。通过使用Ts保护的双官能硫化物催化剂和Ms保护的邻炔基芳基胺(Ts =甲苯磺酰基; Ms =甲磺酰基),可以实现这种对映选择性转化。亲电芳基硫醇化试剂和亲电三氟甲基硫醇化试剂均适用于该反应。轴向手性乙烯基-芳基氨基硫化物的所得产物可以容易地转化为联芳基氨基硫化物,联芳基氨基亚砜,联芳基胺,乙烯基芳基胺和其他有价值的双官能化化合物。
Asymmetric Catalytic Approach to Multilayer 3D Chirality
environment nearby the Pd metal center. Three rings of multilayer 3D products can be readily changed by varying aromatic ring-anchored starting materials. The resulting multilayer products displayed strong luminescence under UV irradiation and strong aggregation-induced emission (AIE). In the future, this work would benefit not only the field of asymmetric synthesis but also materials science, in particular
NHC-Catalyzed Atroposelective Acylation of Phenols: Access to Enantiopure NOBIN Analogs by Desymmetrization
作者:Shenci Lu、Si Bei Poh、Zi-Qiang Rong、Yu Zhao
DOI:10.1021/acs.orglett.9b02425
日期:2019.8.2
Herein we present a highly efficient N-heterocyclic-carbene (NHC)-catalyzed atroposelective acylation of amino bisphenols to provide access to a wide range of 1,1′-biaryl-2,2′-amino alcohols (NOBIN analogs) in high yield and with uniformly excellent enantioselectivity. This catalytic system is shown to proceed through a combination of desymmetrization and secondary kineticresolution to produce the axially
A catalyst-free and additive-free method for the synthesis of benzothiazolethiones from <i>o</i>-iodoanilines, DMSO and potassium sulfide
作者:Xiaoming Zhu、Wenguang Li、Xiai Luo、Guobo Deng、Yun Liang、Jianbing Liu
DOI:10.1039/c8gc00477c
日期:——
Under catalyst-free and additive-free conditions, a novel, convenient, environment-friendly method for the synthesis of benzothiazolethiones from o-iodoanilines, K2S and DMSO has been developed.
Copper-Catalyzed Asymmetric Ring-Opening of Cyclic Diaryliodonium with Benzylic and Aliphatic Amines
作者:Shibo Xu、Kun Zhao、Zhenhua Gu
DOI:10.1002/adsc.201800637
日期:2018.10.18
A Cu‐catalyzed asymmetric ring‐opening reaction between cyclic diaryliodonium and benzylic or aliphatic amines has been developed. At low concentration of the amines, realized by either mixing the amines with Lewis acid or slow addition of the amines, the reaction afforded the products in high enantioselectivity.