Direct Bis-Arylation of Cyclobutanecarboxamide via Double C–H Activation: An Auxiliary-Aided Diastereoselective Pd-Catalyzed Access to Trisubstituted Cyclobutane Scaffolds Having Three Contiguous Stereocenters and an All-<i>cis</i> Stereochemistry
An auxiliary-aided Pd-catalyzed highly diastereoselective double C–Hactivation and direct bis-arylation of methylene C(sp3)–H bonds of cyclobutanecarboxamides and the syntheses of several novel trisubstituted cyclobutanecarboxamide scaffolds having an all-cis stereochemistry are reported. Extensive screening of various auxiliaries and reaction conditions was performed to firmly establish the optimized
A Simple Aliphatic Diamine Auxiliary for Palladium-Catalyzed Arylation of Unactivated <i>β</i>
-C(<i>sp</i>
<sup>3</sup>
)-H Bonds
作者:Jiang Lou、Quannan Wang、Yuan He、Zhengkun Yu
DOI:10.1002/adsc.201801022
日期:2018.12.3
Palladium‐catalyzed β‐C(sp3)‐Harylation of aliphatic acid derivatives was achieved by means of 2‐dimethylaminoethylamine auxiliary as a directing group. The β‐C(sp3)‐Harylation reactions with aryl and heteroaryl iodides efficiently afforded the corresponding arylated hydrocinnamic acid derivatives. Direct β‐C(sp3)‐H alkynylation, and arene C−H arylation and alkynylation were also realized under the