Enantioselective γ‐Addition of Pyrazole and Imidazole Heterocycles to Allenoates Catalyzed by Chiral Phosphine
作者:Haiyang Wang、Chang Guo
DOI:10.1002/anie.201813381
日期:2019.2.25
catalyze the enantioselective asymmetric γ‐addition of heteroaromatic compounds to allenoates in good yields with high enantiomeric ratios and regioselectivity in the presence of (S)‐BINOL. Both pyrazole and imidazole could be employed in this process. The synthetic value of these γ‐addition products was demonstrated by the preparation of biologically relevant molecules and structural scaffolds. Remarkably
The invention comprises substituted diazaindole-dicarbonyl-piperazinyl derivatives of general Formula I
wherein:
Q is selected from the group consisting of
— may represent a bond; T is —C(O)— or —CH(CN)—; and
—Y— is selected from the group consisting of
compositions thereof and their use for treating HIV infection.
Retracted Article: Molybdenum-silver co-catalyzed cycloaddition of alkynes with <i>N</i>-isocyanoiminotriphenylphosphorane (NIITP): an efficient strategy for the synthesis of monosubstituted pyrazoles
作者:Pengbing Mi、Jiajia Lang、Shaojian Lin
DOI:10.1039/c9cc03363g
日期:——
A new molybdenum-silver co-catalyzed [3+2] cycloaddition of alkynes with N-isocyanoiminotriphenylphosphorane (NIITP) has been described. The NIITP serves as a non-toxic, facile “CNN” source. Over 30 substrates were successfully converted to the desired compounds in good to excellent yields.
strategy involving copper(II) ions, tert-butylphosphonic acid (t-BuPO3H2) and 3-substituted pyrazole ligands has been adopted for the synthesis of soluble molecular copper(II) phosphonates. The use of six different 3-substituted pyrazoles, 3-R-PzH [R = H, Me, CF3, Ph, 2-pyridyl (2-Py), and 2-methoxyphenyl (2-MeO-C6H4)] as ancillary ligands afforded nine different decanuclear cages, [Cu5(μ3-OH)2(O3P-
Enhanced Catalytic Activity of Aluminum Complexes for the Ring-Opening Polymerization of ε-Caprolactone
作者:Someswara Rao Kosuru、Ting-Han Sun、Li-Fang Wang、Jaya Kishore Vandavasi、Wei-Yi Lu、Yi-Chun Lai、Sodio C. N. Hsu、Michael Y. Chiang、Hsuan-Ying Chen
DOI:10.1021/acs.inorgchem.7b00763
日期:2017.7.17
A series of dinuclear aluminum (Al2Pyr2) complexes bridged by two pyrazole ligands were synthesized, and their catalyticactivity toward ring-opening polymerization of ε-caprolactone (CL) was investigated. Different types of the Al–N–N–Al–N–N skeletal ring were found among these Al2Pyr2 complexes. The butterfly form, LThio2Al2Me4, exerted the highest catalyticactivity for CL polymerization. κ2-CL