94010-79-4Relevant academic research and scientific papers
Synthesis of Chiral Tertiary α,α-Difluoromethyl Carbinols by Cu-Catalyzed Asymmetric Propargylation
Ding, Kuiling,Guo, Peihua,Wang, Xiaoming,Wang, Zheng,Zhang, Rui
, (2019)
Chiral α,α-difluoromethyl carbinols are recurring structural motifs in many therapeutic agents. Despite the indubitable interest in the catalytic asymmetric synthesis of such compounds, this research field still remains largely underexplored. Herein, an efficient approach to a range of chiral homopropargylic α,α-difluoromethyl carbinols has been developed, through a Cu-catalyzed enantioselective propargylation of α,α-difluoroketones with (pinacolato)allenylboron. In the presence of a cuprous complex, generated in situ from CuCl and a spiroketal-based diphosphine (SKP) ligand, a variety of aryl-, heteroaryl-, alkyl-, alkynyl, alkenyl, or benzyloxycarbonyl-substituted α,α-difluoromethyl carbinols were obtained in 75–99 % yields with 84–98 % ee values. The catalytic system was further investigated using a combined dynamic NMR spectroscopic, X-ray crystallographic, and non-linear effect studies. The origin of the enantioselectivity was rationalized based on DFT calculations. Finally, several efficient transformations were showcased to highlight the utilities of the protocol in synthesis of complex compounds bearing an α,α-difluoromethyl carbinol moiety.
QUINOLINE AND ISOQUINOLINE COMPOUNDS AND METHODS OF USE THEREOF
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Page/Page column 88, (2012/03/26)
Provided herein are compounds for treatment of JAK kinase mediated diseases, including JAK2 kinase-, JAK3 kinase- or TYK2 kinase-mediated diseases. Also provided are pharmaceutical compositions comprising the compounds and methods of using the compounds a
