The first enantioselective chiral phosphoricacid-catalyzedtransferhydrogenation of N-aryl-ortho-hydroxybenzophenoneketimines using a Hantzsch ester as hydrogen source was developed to afford, after removal of the N-aryl group, the corresponding chiral diarylmethylamines in high yields and enantioselectivities.
Aerobic Copper‐Catalyzed Salicylaldehydic C
<sub>formyl</sub>
−H Arylations with Arylboronic Acids
作者:Lin Xiao、Tao‐Tao Lang、Ying Jiang、Zhong‐Lin Zang、Cheng‐He Zhou、Gui‐Xin Cai
DOI:10.1002/chem.202004810
日期:2021.2.15
We report a challenging copper‐catalyzed Cformyl−H arylation of salicylaldehydes with arylboronic acids that involves unique salicylaldehydic copper species that differ from reported salicylaldehydic rhodacycles and palladacycles. This protocol has high chemoselectivity for the Cformyl−H bond compared to the phenolic O−H bond involving copper catalysis under high reaction temperatures. This approach
我们报道了具有挑战性的水杨醛与芳基硼酸的铜催化的C甲酰基-H芳基化反应,其中涉及独特的水杨醛醛铜种类,不同于报道的水杨醛Rhodacycles和palladacycles。与在高反应温度下涉及铜催化的酚式O-H键相比,该方案对C甲酰基-H键具有较高的化学选择性。该方法与广泛的水杨醛和芳基硼酸底物兼容,包括雌酮和咔唑衍生物,可产生相应的芳基化产物。机理研究表明,水杨醛底物的2-羟基基团通过Cu I / Cu II触发水杨醛醛铜络合物的形成/ Cu III催化循环。
Sc(OTf)<sub>3</sub>/BF<sub>3</sub>·OEt<sub>2</sub>-Catalyzed Annulation of 3-Formylchromones with Functionalized Alkenes: Access to Diverse 2-Hydroxybenzophenones
作者:Sabera Sultana、Peter Yuosef M. Rubio、Hari Datta Khanal、Yong Rok Lee
DOI:10.1021/acs.orglett.2c01538
日期:2022.6.24
ed annulation of 3-formylchromones with functionalized alkenes for the direct construction of 2-hydroxybenzophenones is described. Sc(OTf)3/BF3·OEt2 acts as a synergistic catalyst, providing rapid synthetic access to diversely and highly functionalized 2-hydroxybenzophenones. This reaction has excellent regio- and chemoselectivities and is suitable for late-stage functionalization. The reaction proceeds
Rh(III)-catalyzed aldehyde C–H bond functionalization of salicylaldehydes with arylboronic acids
作者:Dahai Wang、Sunliang Cui
DOI:10.1016/j.tet.2015.09.053
日期:2015.11
A Rh(III)-catalyzed aldehyde C-H bond functionalization of salicylaldehydes with arylboronic acids has been developed, with features of mild reaction condition and high efficiency. Furthermore, the functionalized 2-hydroxybenzophenone could be subject to divergent synthesis of heterocycles. (C) 2015 Elsevier Ltd. All rights reserved.
KUMAR, SHIV;BHADURI, A. P., INDIAN J. CHEM., 1983, 22, N 1, 17-22