Visible-Light Photocatalytic Aerobic Annulation for the Green Synthesis of Pyrazoles
作者:Ya Ding、Te Zhang、Qiu-Yun Chen、Chunyin Zhu
DOI:10.1021/acs.orglett.6b01867
日期:2016.9.2
A selective and high yielding synthesis of polysubstituted pyrazoles through a VLPC (visible light photoredox catalysis)-promoted reaction of hydrazine with Michael acceptors is reported. The method employs very mild reaction conditions and usesair as the terminal oxidant, which makes the process environmentally benign. Different types of Michael acceptors with various substituents can undergo the
Compounds having the structure of Formula I, including pharmaceutically acceptable salts of the compounds, are CETP inhibitors and are useful for raising HDL-cholesterol, reducing LDL-cholesterol, and for treating or preventing atherosclerosis. In the compound of Formula I, A
3
is a substituted phenyl group or indanyl group. Formula (I).
3-Aryl-5-pyrazole-carboxylic-acid derivatives, their preparation and pharmaceutical compositions
申请人:ELI LILLY AND COMPANY
公开号:EP0112623A2
公开(公告)日:1984-07-04
Pyrazole derivatives of formula (I):
wherein R' is hydrogen or methyl; Ar is pyridyl, thienyl, or optionally substituted phenyl; X is NH2, H, OH, halogen or C1-3 alkyl; and R is OH, OM, O-alk, NH2, NH-alk, N(alk)2 or N-alken-N-(alk)2; wherein alk is C1-5 alkyl; alken is (CH2)2 or (CH2)3 and M is a non-toxic cation; are useful in lowering blood urate levels in mammals.