Ligand‐Enabled β‐C–H Arylation of α‐Amino Acids Without Installing Exogenous Directing Groups
作者:Gang Chen、Zhe Zhuang、Gen‐Cheng Li、Tyler G. Saint‐Denis、Yi Hsiao、Candice L. Joe、Jin‐Quan Yu
DOI:10.1002/anie.201610580
日期:2017.2
Herein we report acid‐directed β‐C(sp3)‐Harylation of α‐amino acids enabled by pyridine‐type ligands. This reaction does not require the installation of an exogenous directinggroup, is scalable, and enables the preparation of Fmoc‐protected unnatural amino acids in three steps. The pyridine‐type ligands are crucial for the development of this new C(sp3)‐Harylation.
Amide-directed arylation of sp3 C–H bonds using Pd(II) and Pd(0) catalysts
作者:Masayuki Wasa、Jin-Quan Yu
DOI:10.1016/j.tet.2010.03.111
日期:2010.6
Protocols to effect β-arylation of sp3 C–Hbonds via Pd(II)/(IV) and Pd(0)/(II) catalytic cycles have been achieved using a newly developed monodentate CONHC6F5 directing group. These reactions provide an unprecedented means to functionalize sp3 C–Hbonds in aliphatic carboxylic acid-derived substrates.
Pd-Catalyzed Regioselective Branched Hydrocarboxylation of Terminal Olefins with Formic Acid
作者:Wenlong Ren、Mingzhou Wang、Jianqiong Guo、Jintao Zhou、Jianxiao Chu、Yuan Shi、Yian Shi
DOI:10.1021/acs.orglett.1c04231
日期:2022.1.28
A regioselectivePd-catalyzed hydrocarboxylation of terminal olefins with HCOOH is described. A wide variety of branched carboxylic acids can readily be obtained with high regioselectivities under mild reaction conditions. The reaction is operationally simple and requires no handling of toxic CO. The ligand and LiCl are important factors for reaction reactivity and selectivity.
Silver-Catalyzed Decarboxylative Allylation of Aliphatic Carboxylic Acids in Aqueous Solution
作者:Lei Cui、He Chen、Chao Liu、Chaozhong Li
DOI:10.1021/acs.orglett.6b00802
日期:2016.5.6
Direct decarboxylative radical allylation of aliphaticcarboxylicacids is described. With K2S2O8 as the oxidant and AgNO3 as the catalyst, the reactions of aliphaticcarboxylicacids with allyl sulfones in aqueous CH3CN solution gave the corresponding alkenes in satisfactory yields under mild conditions. This site-specific allylation method is applicable to all primary, secondary, and tertiary alkyl
描述了脂肪族羧酸的直接脱羧自由基烯丙基化。以K 2 S 2 O 8为氧化剂,AgNO 3为催化剂,脂肪族羧酸与烯丙基砜在CH 3 CN水溶液中的反应在温和条件下以令人满意的收率得到了相应的烯烃。此位点特定的烯丙基化方法适用于所有伯,仲和叔烷基酸,并具有广泛的官能团相容性。
Pd-Catalyzed sequential β-C(sp<sup>3</sup>)–H arylation and intramolecular amination of δ-C(sp<sup>2</sup>)–H bonds for synthesis of quinolinones via an N,O-bidentate directing group
The pharmacological importance of 2-quinolinone derivatives is well known. Herein, we developed an effective protocol for the synthesis of 2-quinlinolinone derivatives by palladium-catalyzed sequential [small beta]-C(sp3)-H arylation and selective intramolecular C(sp2)-H/N-H...