Chemoselective and Regiospecific Formylation of 1-Phenyl-1H-pyrazoles Through the Duff Reaction
摘要:
The synthesis of formylated 1-phenyl-1H-pyrazole derivatives under the Duff reaction conditions is reported. Our results indicate that 1-phenyl-1H-pyrazole systems containing electron-withdrawing and electron-donating substituents at the phenyl moiety react under the Duff reaction conditions to furnish formylated derivatives in good yields.
Green and versatile! The photocatalytic C(sp2)−H azolation of arenesusingheterogeneouscarbonnitride is reported. This strategy exhibits a broad substrate scope and is amenable to the late-stage functionalization of several pharmaceuticals. The catalyst can be easily recovered and reused leading to greener and more sustainable routes.
Complete assignment of NMR data of 22 phenyl-1<i>H</i>
-pyrazoles' derivatives
作者:Aline Lima de Oliveira、Carlos Henrique Alves de Oliveira、Laura Maia Mairink、Francine Pazini、Ricardo Menegatti、Luciano Morais Lião
DOI:10.1002/mrc.2773
日期:2011.8
Completeassignment of 1H and 13C NMR chemical shifts and J(1H/1H and 1H/19F) coupling constants for 22 1‐phenyl‐1H‐pyrazoles' derivates were performed using the concerted application of 1H 1D and 1H, 13C 2D gs‐HSQC and gs‐HMBC experiments. All 1‐phenyl‐1H‐pyrazoles' derivatives were synthesized as described by Finar and co‐workers. The formylated 1‐phenyl‐1H‐pyrazoles' derivatives were performed under
SUBSTITUTED 3,4-DIHYDRO-2H-PYRIDO[1,2-A]PYRAZINE-1,6-DIONE DERIVATIVES USEFUL FOR THE TREATMENT OF (INTER ALIA) ALZHEIMER'S DISEASE
申请人:Janssen Pharmaceuticals, Inc.
公开号:US20150141411A1
公开(公告)日:2015-05-21
The present invention is concerned with novel substituted 3,4-dihydro-2H-pyrido[1,2-a]pyrazine-1,6-dione derivatives of Formula (I) wherein R
1
, R
2
, R
3
, R
4
, R
5
, Z and X have the meaning defined in the claims. The compounds according to the present invention are useful as gamma secretase modulators. The invention further relates to processes for preparing such novel compounds, pharmaceutical compositions comprising said compounds as an active ingredient as well as the use of said compounds as a medicament.