Design and synthesis of HIV protease inhibitors. Variations of the carboxyterminus of the HIV protease inhibitor L-682,679
摘要:
A series of tetrapeptide analogues of 1 (L-682,679), in which the carboxy terminus has been shortened and modified, was prepared and their inhibitory activity measured against the HIV protease in a peptide cleavage assay. Selected examples were tested as inhibitors of virus spread in cell culture. Compound 12 was a 10-fold more potent enzyme inhibitor than 1 in vitro and 30-fold more potent in inhibiting the viral spread in cells.
The l -tert-leucine-derived AmidPhos/silver(I) catalytic system has been developed for the asymmetric [3+2] cycloaddition of azomethineylides with electronic-deficient alkenes with or without Et3N. Under optimal conditions, highly functionalized endo-4-pyrrolidines were obtained with modest to high yields (up to 99% yield) and enantioselectivities (up to 98% ee).
C2 symmetrical nickel complexes derived from α-amino amides as efficient catalysts for the enantioselective addition of dialkylzinc reagents to aldehydes
作者:Jorge Escorihuela、Belen Altava、M. Isabel Burguete、Santiago V. Luis
DOI:10.1016/j.tet.2012.11.025
日期:2013.1
amides were studied for the enantioselectiveaddition of dialkylzincreagents to aldehydes. Different structural elements on the ligands seem to play an important role in determining the observed enantioselectivity. Through optimization of structure and reaction conditions, the best ligand provided secondary alcohols in excellent yields (up to 98%) and enantioselectivity of up to 99% ee for (R)-enantiomer
Asymmetric phosphoric acid–catalyzed four-component Ugi reaction
作者:Jian Zhang、Peiyuan Yu、Shao-Yu Li、He Sun、Shao-Hua Xiang、Jun (Joelle) Wang、Kendall N. Houk、Bin Tan
DOI:10.1126/science.aas8707
日期:2018.9.14
the stereochemical outcome of this reaction. CONCLUSION This operationally simple one-pot enantioselective Ugi-4CR harnesses inherent benefits of multicomponent reaction and organocatalysis to access up to 86 enantioenriched α-acylaminoamides, which are otherwise challenging to obtain via conventional methods, from four achiral building blocks in excellent yields and enantioselectivities. DFT calculations
将所有四个 Ugi 部分结合在一起 将近 60 年历史的 Ugi 反应是将四个分子结构单元连接在一起的非常有效的方法:醛、胺、羧酸和异氰化物。由于每个组件都是独立可调的,因此该反应特别适合组装不同的化合物库。然而,立体选择性一直是一个挑战。张等人。现在表明手性磷酸可以以高对映选择性催化四组分偶联(参见 Riva 的观点)。理论表明,涉及磷酸和羧酸的氢键配合物设定了异氰化物攻击亚胺中间体的立体化学。科学,这个问题 p。eaas8707; 另见第。1072 手性磷酸衍生物对映选择性地将醛连接在一起,羧酸、胺和异氰化物。引言 四组分 Ugi 反应 (Ugi-4CR) 通过羰基化合物、胺、酸和异氰化物的一锅反应组装肽样 α-酰基氨基酰胺。Ugi-4CR 非常适合适用于药物发现的面向多样性的合成,因为它有助于快速访问不同的生物重要分子库。该反应的高步骤经济性和原子效率,以及其收敛性,促进了其在杂环支
SAR evolution towards potent C-terminal carboxamide peptide inhibitors of Zika virus NS2B-NS3 protease
Zikavirus (ZIKV) is a member of the Flaviviridae family that can cause neurological disorders and congenital malformations. The NS2B-NS3 viral serine protease is an attractive target for the development of new antiviral agents against ZIKV. We report here a SAR study on a series of substrate-like linear tripeptides that inhibit in a non-covalent manner the NS2B-NS3 protease. Optimization of the residues