α‐modification of amides is still a challenge because of the low acidity of α‐CH groups. The α‐functionalization of N−H (primary and secondary) amides, containing both an unactived α‐C−H bond and a competitively active N−H bond, remains elusive. Shown herein is the general and efficient oxidative α‐oxyamination and hydroxylation of aliphaticamides including secondary N−H amides. This transition‐metal‐free
A Novel Dehydrazination Reaction. V. The Formation of Various Amides from Aliphatic and Aromatic Carboxylic Acid Hydrazides in the Presence of Chloral
作者:Tetsuji Kametani、Osamu Umezawa
DOI:10.1248/cpb.14.369
日期:——
In the previous papers the reactions between aromatic, aliphatic and heterocyclic carboxylic acid hydrazides and either chloral or bromal in various alcohols were attempted and respective esters were obtained. In this paper the reactions of aromatic and aliphatic acid hydrazide with chloral in the presence of various amines were examined, leading eventually to reveal the formation of our expected acid amides as are shown in Table I and II. The intermediates in this reaction, 1-benzoyl-2-(2, 2, 2-trichloroethylidene) hydrazine (III : R=C6H5-, X=Cl) was found to form the amides (VI) when heated in amines. This fact indicated that the acid hydrazides converted to their amides through III.
Metal‐free Photocatalytic Intermolecular anti‐Markovnikov Hydroamination of Unactivated Alkenes
作者:Gaoyuan Zhao、Juncheng Li、Ting Wang
DOI:10.1002/ejoc.202100049
日期:2021.5.14
A metal‐free intermolecularhydroamination reaction induced by visible light was developed. These reactions show great generality of a variety of N‐radicals and alkenes, providing direct access to various masked amines. The radical strategy provides excellent anti‐Markovnikov selectivity and regioselectivity in diene substrates.
Copper-catalyzed oxidative esterification of unactivated C(sp<sup>3</sup>)–H bonds with carboxylic acids via cross dehydrogenative coupling
作者:Jiadi Zhou、Can Jin、Xiaohan Li、Weike Su
DOI:10.1039/c4ra14586k
日期:——
An effective copper-catalyzed esterification of unactivated (non-benzylic and allylic) C(sp3)–Hbonds of hydrocarbons with Selectfluor as an oxidant has been developed. This reaction could provide a direct, new and useful strategy for the synthesis of esters and alkyl alcohols by ester hydrolysis.
Copper‐Catalyzed Substrate‐Controlled Carbonylative Synthesis of α‐Keto Amides and Amides from Alkyl Halides
作者:Fengqian Zhao、Han‐Jun Ai、Xiao‐Feng Wu
DOI:10.1002/anie.202200062
日期:2022.4.19
A copper-catalyzed highly selective double carbonylation of alkyl bromides and amines has been developed. Desired α-keto amides were obtained as the only products. Subsequently, under different conditions, the double and mono-carbonylations of alkyl iodides with amines were also achieved.