One-pot efficient synthesis of N α-urethane-protected β- and γ-amino acids
摘要:
1-[(4-Methylphenyl)oxy]pyrrolidine-2,5-dione and 1-[(4-methylphenyl)oxy]piperidine-2,6-dione react in a Lossen-type reaction with primary alcohols in the presence of triethylamine to furnish corresponding N (alpha)-urethane-protected beta-alanine and gamma-aminopropionic acid (GABA), respectively, with excellent yields and purities, in an essentially "one-pot" procedure.
Cellular Protection of SNAP-25 against Botulinum Neurotoxin/A: Inhibition of Thioredoxin Reductase through a Suicide Substrate Mechanism
作者:Hajime Seki、Song Xue、Sabine Pellett、Peter Šilhár、Eric A. Johnson、Kim D. Janda
DOI:10.1021/jacs.5b12929
日期:2016.5.4
attempts to ablate BoNT/A intoxication have sought to either nullify cellulartoxin entry or critical biochemical junctions found within its intricate mechanism of action. In these regards, reports have surfaced of nonpeptidic small molecule inhibitors, but few have demonstrated efficacy in neutralizing cellular toxicity, a key prerequisite before rodent lethality studies can be initiated. On the basis
The reaction of N-(3-phenylpropionyloxy)phthalimide (1a) and N-tosyloxy (5a,b) derivatives with nucleophiles was examined and found to give the products via Lossen-type rearrangement. In order to obtain the scope of this reaction mechanism, further studies the reaction of several N-sulfonyloxyimide derivatives with various nucleophiles under similar conditions were carried out and found to afford the
Reactions of the structural model hydrolases [M2(OAc)4(H2O)(Im)4]; M=Mn (E′); M=Co (D′); M=Ni (B′) and [M2(OPiv)4(H2O)(tmen)2]; M=Mn (E″); M=Co (D″); M=Ni (B″) with a number of hydroxamic acids, RHA (aceto- (R=CH3), benzo- (R = C6H5) and N-phenylacetohydroxamic acid (NPhAHA)) gave a series of hydroxamate dibridged complexes [M2(OAc)(RA)2(Im)4][OTf] and [M2(OPiv)(RA)2(tmen)2][OTf]; M=Co, Ni, in which the bridging