已经发现,在5mol%的碘化亚铜(I)存在下,格氏试剂可将磺酰基活化的sp 3碳-氮键裂解。重要的是,广泛的磺酰基活化的苄基,烯丙基和炔丙基胺与格利雅试剂进行平滑的交叉偶联反应,从而提供结构多样的偶联产物,收率高至优异,并具有较高的化学,区域和立体选择性。此外,已经证明S N 2机理参与交叉偶联反应,该交叉偶联反应允许由旋光的α-支化胺衍生物不对称地合成手性烃。
An electrostatically directed meta borylation of sterically biased and unbiased substrates is described. The borylation follows an electrostatic interaction between the partially positive and negative charges between the ligand and substrate. With this strategy, it has been demonstrated that a wide number of challenging substrates, especially 4-substituted substrates, can selectively be borylated at
作者:Bifu Liu、Wensen Ouyang、Jianhong Nie、Yang Gao、Kejun Feng、Yanping Huo、Qian Chen、Xianwei Li
DOI:10.1039/d0cc04739b
日期:——
coordinated amine derivative enabled regioselective C–H functionalization remains challenging due to the elusive achievement of reactivity and selectivity simultaneously. Herein, regioselective C–Halkynylation of various readily transformable nitrogen functionalities was developed with great efficiency, with the assistance of the mono-N-protected amino acid (MPAA) ligand via Pd(II) catalysis proceeding via
Palladium-Catalyzed Oxidative Acylation of<i>N</i>-Benzyltriflamides with Aldehydes<i>via</i>CH Bond Activation
作者:Satyasheel Sharma、Jihye Park、Eonjeong Park、Aejin Kim、Minyoung Kim、Jong Hwan Kwak、Young Hoon Jung、In Su Kim
DOI:10.1002/adsc.201200889
日期:2013.1.29
A palladium-catalyzed ortho-acylation of N-benzyltriflamides with aldehydes via direct sp2 CH bondactivation is described. Benzylamines with a triflamide directing group in the presence of palladium acetate, acetic acid, and tert-butyl hydroperoxide as an oxidant can be effectively coupled with aryl and alkyl aldehydes to provide ortho-acyl-N-benzyltriflamides with a high regioselectivity.
Direct acylation of N-benzyltriflamides from the alcohol oxidation level via palladium-catalyzed C–H bond activation
作者:Jihye Park、Aejin Kim、Satyasheel Sharma、Minyoung Kim、Eonjeong Park、Yukyoung Jeon、Youngil Lee、Jong Hwan Kwak、Young Hoon Jung、In Su Kim
DOI:10.1039/c3ob40140e
日期:——
A palladium-catalyzed ortho-acylation of N-benzyltriflamides from the alcohol oxidation level via C–H bondactivation is described. These transformations have been applied to a wide range of substrates, and typically proceed with excellent levels of chemoselectivity and with high functional group tolerance.
cyclization via C(sp2)–H activation with a cooperative catalytic system consisting of a Cp*Rh(III) complex and a chiral Lewis base is described. An α,β-unsaturated acyl ammonium intermediate is generated from a chiral isochalcogenurea catalyst and an acyl fluoride reacts with a metallacycle generated from the Cp*Rh catalyst and a benzylamine derivative. This cooperative catalytic system gives a variety