Bimolecular nucleophilic substitution (SN2) is one of the most well-known fundamental reactions in organic chemistry to generate new molecules from two molecules. In principle, a nucleophile attacks from the back side of an alkylatingagent having a suitable leaving group, most commonly a halide. However, alkyl halides are expensive, very harmful, toxic and not so stable, which makes them problematic
Direct Regioselective Synthesis of Tetrazolium Salts by Activation of Secondary Amides under Mild Conditions
作者:Veronica Tona、Boris Maryasin、Aurélien de la Torre、Josefine Sprachmann、Leticia González、Nuno Maulide
DOI:10.1021/acs.orglett.7b01004
日期:2017.5.19
Tetrazolium salts are biologically active molecules that have found broad applications in biochemical assays. A regioselective synthesis of tetrazolium salts is described through a formal (3 + 2) cycloaddition. The possibility of employing simple amides and azides as starting material and the mild conditions allow a broad functional group tolerance.
Chemoselective calcium-catalysed direct amidation of carboxylic esters
作者:D. Thao Nguyen、Danny C. Lenstra、Jasmin Mecinović
DOI:10.1039/c5ra18288c
日期:——
Cheap, non-toxic and environmentally benign CaI2 catalyses direct amide bond formation between unactivated carboxylic esters and primary amines in excellent yields.
[EN] 2-AMINO-QUINAZOLINE DERIVATIVES USEFUL AS INHIBITORS OF B-SECRETASE (BACE)<br/>[FR] DERIVES DE 2-AMINO-QUINAZOLINE UTILES EN TANT QU'INHIBITEURS DE B-SECRETASE (BACE)
申请人:JANSSEN PHARMACEUTICA NV
公开号:WO2006024932A1
公开(公告)日:2006-03-09
The present invention is directed to novel 2-amino-3,4-dihydroquinazoline derivatives, pharmaceutical compositions containing them and their use in the treatment of Alzheimer's disease (AD) and related disorders. The compounds of the invention are inhibitors of ß-secretase, also known as ß-site cleaving enzyme and BACE.
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.