Metal-Free Stereoselective Synthesis of (<i>E</i>)- and (<i>Z</i>)-N-Monosubstituted β-Aminoacrylates via Condensation Reactions of Carbamates
作者:Scott R. Pollack、Amélie Dion
DOI:10.1021/acs.joc.1c01212
日期:2021.9.3
acids and pharmaceuticals. Two efficient, stereoselective methods of preparation, via acid- or base-promoted condensation reactions of carbamates, are described. The base-promoted reaction is E-selective, while acid catalysis can, through the choice of solvent, selectively form E or Z. The acid-catalyzed E-selective process proceeds through a crystallization obviating the need for chromatographic purification
Modular Construction of Protected 1,2/1,3-Diols, -Amino Alcohols, and -Diamines via Catalytic Asymmetric Dehydrative Allylation: An Application to Synthesis of Sphingosine
A new enantioselective catalysis has been developed for the one-step construction of methylene-bridged chiral modules of 1,2- and 1,3-OH and/or NH function(s) from δ- or λ-OH/NHBoc-substituted allylicalcohols and “H2C═O”/“H2C═NBoc”. A protonic nucleophile, either in situ-generated CH2OH or CH2NHBoc, is intramolecularly allylated to furnish eight possible 1,2- or 1,3-O,O, -O,N, -N,O, and -N,N chiral
t-Butyl methyl iminodicarboxylate potassium salt: a modified Gabriel reagent for the introduction of t-butoxycarbonylamino groups
作者:John D. Elliott、John H. Jones
DOI:10.1039/c39770000758
日期:——
t-Butylmethyliminodicarboxylatepotassiumsalt is a stable, easily prepared, non hygroscopic compound; it undergoes smooth N-alkylation in dipolar aprotic solvents to give derivatives which suffer loss of the methoxycarbonyl group on mild treatment with alkali, enabling the direct conversion R–X → R–NHBoc (Boc = t-butoxycarbonyl) to be achieved.
Disclosed are aspartic protease inhibitors represented by the following Formula: wherein R
1
, R
2
, R
3
, R
4
, R
5
, R
6
, R
7a
, R
7b
and n are as defined herein, or a pharmaceutically acceptable salt thereof, pharmaceutical compositions comprising the same and methods for treating an aspartic protease mediated disorder using the same.
The instant invention provides for compounds that inhibit the four known mammalian JAK kinases (JAK1, JAK2, JAK3 and TYK2) and PDK1. The invention also provides for compositions comprising such inhibitory compounds and methods of inhibiting the activity of JAK1, JAK2, JAK3 TYK2 and PDK1 by administering the compound to a patient in need of treatment for myeloproliferative disorders or cancer.