Convenient removal of N-tert-butyl from amides with scandium triflate
摘要:
Scandium triflate has been used as a convenient and efficient catalyst for removal of N-tert-butyl from amide groups. A variety of N-tert-butyl aryl and alkyl amides under these conditions gave the corresponding primary amide in high yields. With the use of microwave heating the deprotection reaction could be completed within I h. (c) 2006 Elsevier Ltd. All rights reserved.
Synthesis of amides using the Ritter reaction with bismuth triflate catalysis
作者:Emmanuel Callens、Andrew J. Burton、Anthony G.M. Barrett
DOI:10.1016/j.tetlet.2006.10.023
日期:2006.12
N-tert-Alkyl and aryl amides were obtained by a Ritter reaction of various nitriles with tertiary alcohols in the presence of a catalytic amount of bismuth triflate.
Compounds having the following formula I:
or a stereoisomer or pharmaceutically-acceptable salt thereof, where R
1
, R
2
, R
3
, R
4
, and R
5
are as defined herein, are useful in the modulation of IL-12, IL-23 and/or IFNα, by acting on Tyk-2 to cause signal transduction inhibition.
SO<sub>4</sub><sup>2−</sup>/Ce<i><sub>x</sub></i>Zr<sub>1−</sub><i><sub>x</sub></i>O<sub>2</sub>-catalyzed Synthesis of <i>N</i>-<i>tert</i>-Butylamides from Various Nitriles under Solvent-free Conditions
作者:Sandeep S. Kahandal、Sandip R. Kale、Shamrao T. Disale、Radha V. Jayaram
DOI:10.1246/cl.2012.738
日期:2012.7.5
The synthesis of N-tert-butylamides using SO42−/CexZr1−xO2 catalysts under solvent-free conditions is reported. The methodology has several advantages such as reusability of the catalyst, solvent-free conditions, easy workup, and comparable yield of N-tert-butylamides. A variety of aliphatic, aromatic, and acid-sensitive substrates give high to moderate yields of the corresponding N-tert-butylamides. Surface acidities of the catalysts were correlated with the results obtained. To the best of our knowledge, this is the first report of a modified Ritter reaction on SO42−/CexZr1−xO2 using tert-butyl acetate as carbocationic source.
Nickel-Catalyzed Multicomponent Coupling Reaction of Alkyl Halides, Isocyanides and H2O: An Expedient Way to Access Alkyl Amides
作者:Yunkui Liu、Bingwei Zhou、Qiao Li、Hongwei Jin
DOI:10.1055/s-0040-1707229
日期:2020.11
multicomponent coupling reaction of alkylhalides, isocyanides, and H2O to access alkyl amides. Bench-stable NiCl2(dppp) is competent to initiate this transformation under mild reaction conditions, thus allowing easy operation and adding practical value. Substrate scope studies revealed a broad functional group tolerance and generality of primary and secondary alkylhalides in this protocol. A plausible
CpG OLIGONUCLEOTIDE PRODRUGS, COMPOSITIONS THEREOF AND ASSOCIATED THERAPEUTIC METHODS
申请人:Verthelyi Daniela
公开号:US20090263405A1
公开(公告)日:2009-10-22
The present invention provides a CpG oligonucleotide prodrug that includes a thermolabile substituent on at least one nucleotide thereof. The present invention also provides compositions that include a carrier and a therapeutically effective amount of at least one CpG oligonucleotide prodrug. The present invention further provides therapeutic methods of using such thermolabile CpG oligonucleotide prodrugs and compositions thereof. The present invention further provides a method of inhibiting tetrad formation in a CpG oligonucleotide by functionalizing the CpG oligonucleotide with one or more thermolabile substituents.