Palladium-catalyzed reaction of tributyltin hydride. Selective and very mild deprotection of allyl and allyloxycarbonyl derivatives of amino-acids.
作者:F Guibe、O Dangles、G Balavoine
DOI:10.1016/s0040-4039(00)84530-x
日期:——
Allyl(All) and Allyloxycarbonyl(Alloc) amino-acid derivatives are deprotected through palladium-catalyzed hydrostannolysis by Bu3SnH in a highly selective manner. Benzyl and benzyloxycarbonyl groups are stable under these conditions. Moreover the allyl and Alloc groups seem orthogonal to the t-butyl and t-butoxycarbonyl protecting groups.
benzyl carbocations was investigated using the novel technique for comparing the stability of carbocations in solution developed by using a simple CSI reaction with various ethers. The p-methoxycinnamyl carbocation was the most stable in our reactionsystem and the next stable carbocation was the p-methoxybenzyl carbocation. The stability of the other carbocations decreased with methacryl, t-butyl, cinnamyl
Formation of Ketenimines via the Palladium-Catalyzed Decarboxylative π-Allylic Rearrangement of <i>N</i>-Alloc Ynamides
作者:Juliana R. Alexander、Matthew J. Cook
DOI:10.1021/acs.orglett.7b02780
日期:2017.11.3
A new approach for the formation of ketenimines via a decarboxylative allylic rearrangement pathway that does not require strong stabilizing or protecting groups has been developed. The products can be readily hydrolyzed into their corresponding secondary amides or reacted with sulfur ylides to perform an additional [2,3]-Wittig process. Mechanistic studies suggest an outer-sphere process in which
Facile direct synthesis of unsymmetrical ureas from N-Alloc-, N-Cbz-, and N-Boc-protected amines using DABAL-Me3
作者:Soosung Kang、Hee-Kwon Kim
DOI:10.1016/j.tet.2018.06.011
日期:2018.7
A practical synthetic method for the direct synthesis of unsymmetrically substituted ureas from N-Alloc-, N-Cbz-, and N-Boc-protected amines is described. In this study, efficient direct conversion of the Alloc-, Cbz-, and Boc-carbamate compounds to ureas was achieved in the presence of DABAL-Me3, an air stable and easily handled reagent. Using this reaction method, both protected aromatic and aliphatic
[EN] PYRROLOPYRIDAZINE JAK3 INHIBITORS AND THEIR USE FOR THE TREATMENT OF INFLAMMATORY AND AUTOIMMUNE DISEASES<br/>[FR] INHIBITEURS DE JAK3 DE TYPE PYRROLOPYRIDAZINE ET LEUR UTILISATION POUR TRAITER LES MALADIES INFLAMMATOIRES ET AUTO-IMMUNES
申请人:BRISTOL MYERS SQUIBB CO
公开号:WO2012125893A1
公开(公告)日:2012-09-20
The present invention provides compounds of formula I and pharmaceutically acceptable salts thereof. The formula I compounds inhibit tyrosine kinase activity of JAK3, thereby making them useful for the treatment of inflammatory and autoimmune diseases.