New pyrazolones as 11b-HSD1 inhibitors for diabetes
申请人:Amrein Kurt
公开号:US20070049574A1
公开(公告)日:2007-03-01
Compounds of formula
as well as pharmaceutically acceptable salts and esters thereof, wherein R
1
to R
4
have the significance given in claim
1
can be used in the form of pharmaceutical compositions.
Rhodium‐Catalyzed [4+2] Annulation of N‐Aryl Pyrazolones with Diazo Compounds To Access Pyrazolone‐Fused Cinnolines
作者:Chih‐Yu Lin、Wan‐Wen Huang、Ying‐Ti Huang、Sandip Dhole、Chung‐Ming Sun
DOI:10.1002/ejoc.202101005
日期:2021.9.21
An efficientsynthesis of novel dinitrogen-fused heterocycles, such as pyrazolo[1,2-a]cinnoline derivatives, has been accomplished by the rhodium(III)-catalyzed reaction of N-arylpyrazol-5-ones with diazo compounds. This reaction proceeds through a cascade C−H activation/intramolecular cyclization under mild reaction conditions and features a broad substrate scope.
新型二氮稠合杂环的有效合成,例如吡唑并[1,2- a ]肉啉衍生物,已通过铑(III)催化的N-芳基吡唑-5-酮与重氮化合物的反应完成。该反应在温和的反应条件下通过级联 CH 活化/分子内环化进行,具有广泛的底物范围。
Highly Stereoselective Assembly of Polycyclic Molecules from 1,6-Enynes Triggered by Rhodium(III)-Catalyzed C–H Activation
作者:Heng Lu、Zhoulong Fan、Chaodong Xiong、Ao Zhang
DOI:10.1021/acs.orglett.8b01099
日期:2018.5.18
An Rh(III)-catalyzed C–Hactivation of pyrazolones with 1,6-enynes was investigated. The regioselectivity of the C–Hactivation/alkyne insertion is readily solved by using symmetric enyne coupling partners, and a C–H activation-triggered cascade reaction is realized, which involves alkyne insertion, tautomerization, and double cyclization to offer a class of structurally complex polycyclic architectures
An efficient synthetic strategy for the unique class of pyrazolo[1,2‐a]cinnolines was developed through a rhodium‐catalyzed oxidativecoupling of N‐aryl‐1H‐pyrazol‐5(4H)‐ones with internal alkynes. This protocol features use of the pyrazolone function in the substrate as an intrinsic directing group, hexafluoroisopropyl alcohol (HFIP) as the solvent, and mild reaction conditions as well as a wide substrate
为唯一的类吡唑并的有效的合成策略[1,2一]噌啉通过的铑催化的氧化偶合开发ñ -芳基- 1 H ^ -吡唑-5-(4 ħ) -酮与内部炔烃。该方案的特征是在底物中使用吡唑啉酮功能作为固有的导向基团,在溶剂中使用六氟异丙醇(HFIP),反应条件温和,并且底物范围广。
Gold(<scp>i</scp>)- and rhodium(<scp>iii</scp>)-catalyzed formal regiodivergent C–H alkynylation of 1-arylpyrazolones
作者:Xueli Wang、Xingwei Li、Yao Zhang、Lixin Xia
DOI:10.1039/c8ob00585k
日期:——
Formal regiodivergent C–H alkynylation of 1-aryl-5-pyrazolones has been realized under the catalysis of Rh(III) and Au(I) complexes by using a hypervalent iodine reagent as the alkyne source. Mechanistic studies indicate that the regioselectivity is ascribed to not only the choice of the catalyst but also the nature of the substrate. The substrate scope and functional group compatibility have been