Generation of allylic and benzylic organolithium reagents from the corresponding ester, amide, carbonate, carbamate and urea derivatives
摘要:
The reaction of different allylic and benzylic non-enolisable esters or amides (1), carbonates (4), carbamates (6, 7) and ureas (8) with an excess of lithium powder and a catalytic amount of naphthalene (10%) in the presence of an electrophile [iPrCHO, tBuCHO, PhCHO, Me2CO, Et2CO, (CH2)(5)CO, Ph2CO, MeSiCl] in THF at different temperatures (-78, -30 or 0 degrees C) leads, after hydrolysis with water, to the corresponding allylated or benzylated products (2). (C) 1999 Elsevier Science Ltd. All rights reserved.
Sterically Demanding Oxidative Amidation of α-Substituted Malononitriles with Amines Using O<sub>2</sub>
作者:Jing Li、Martin J. Lear、Yujiro Hayashi
DOI:10.1002/anie.201603399
日期:2016.7.25
An efficient amidation method between readily available 1,1-dicyanoalkanes and either chiral or nonchiral amines was realized simply with molecular oxygen and a carbonate base. This oxidative protocol can be applied to both sterically and electronically challenging substrates in a highly chemoselective, practical, and rapid manner. The use of cyclopropyl and thioether substrates support the radical
sphonate [DPPOx] has been newly introduced as a carboxyl-activating reagent which permits a facile direct preparation of 3-acyl-2-oxazolones and amides including peptides from a wide variety of carboxylicacids The 3-acyl-2-oxazolides also serve as versatile reactive agents for highlychemoselective acyl-transfer to the nucleophilic species such as amines, alcohols and thiols, providing convenient
A compound having the general structure of Formula (I):
or a pharmaceutically acceptable salt, solvate, or ester thereof, is useful in treating diseases, disorders, or conditions such as obesity, metabolic disorders, addiction, diseases of the central nervous system, cardiovascular disorders, respiratory disorders, and gastrointestinal disorders.
The present invention relates to chemical compounds, methods for their discovery, and their therapeutic use. In particular, the present invention provides compounds as inhibitors of arboviruses.