A Parallel Approach to 7-(Hetero)arylpyrazolo[1,5-a]pyrimidin-5-ones
摘要:
A modular, two-pot assembly of 7-arylpyrazolo[1,5-a]pyrimidones from aryl/heteroaryl halides and aminopyrazoles in library format was developed. Sonogashira coupling of aryl bromides with triethyl orthopropiolate, followed by in situ orthoester hydrolysis, provides access to beta-aryl ynoates, which undergo regioselective cyclocondensation with aminopyrazoles. The ability to vary the C7 vector of 7-arylpyrazolo[1,5-cdpyrimidones in two steps using readily available (hetero)aryl halides significantly enhances synthetic access to this challenging vector.
Ruthenium-Catalyzed Asymmetric [2 + 2] Cycloadditions between Chiral Acyl Camphorsultam-Substituted Alkynes and Bicyclic Alkenes
作者:Jordan Goodreid、Karine Villeneuve、Emily Carlson、William Tam
DOI:10.1021/jo501594g
日期:2014.11.7
Ruthenium-catalyzedasymmetric [2 + 2] cycloadditionsbetweenchiralacyl camphorsultam-functionalized alkynes and bicyclicalkenes were examined, providing adducts with complete exo stereoselectivity in good overall yield and enantioselectivity (up to 99% and 166:1, respectively), as well as appreciable diastereoselectivity (up to 163:1). The diastereoselectivity showed dependence on the solvent and
The palladium-catalyzed cross-coupling reaction of aryl iodides with 3,3,3-triethoxy-1-propyne gave 1-aryl-3,3,3-triethoxy-1-propynes which were converted to the corresponding ethyl arylpropiolates. The arylpropiolates were also synthesized from the cross-coupling reactions of aryl iodides with 2-ethoxycarbonyl-1-ethynylzinc chloride or ethyl (tributylstannyl)propiolate, but the reactions were not generally applicable.
[EN] TRIAZOLE DERIVATIVES AND THEIR USE FOR NEUROLOGICAL DISORDERS<br/>[FR] DÉRIVÉS DE TRIAZOLE ET LEUR UTILISATION POUR DES TROUBLES NEUROLOGIQUES
申请人:HOFFMANN LA ROCHE
公开号:WO2012062687A1
公开(公告)日:2012-05-18
The present invention is concerned with novel triazole compounds of formula (I) wherein A, X, Y, Z, R1, R2, and R3 are as described herein, as well as pharmaceutically acceptable salts and esters thereof. The active compounds of present invention have affinity and selectivity for the GABA A α5 receptor. Further the present invention is concerned with the manufacture of the compounds of formula (I), pharmaceutical compositions comprising them and their use as medicaments.
本发明涉及一种新型三唑化合物,其化学式为(I),其中A、X、Y、Z、R1、R2和R3如本文所述,以及其药学上可接受的盐和酯。本发明的活性化合物具有对GABA A α5受体的亲和力和选择性。此外,本发明涉及制备化合物(I)的方法,包括它们的药物组合物以及它们作为药物的用途。
Gold-Catalyzed Partial Hydrogenation of Activated Alkynes Mediated by Triphenylphosphine
Gold(I) can exhibit a cooperative effect with triphenylphosphine, accelerating the triphenylphosphine-mediated partial hydrogenation of activated alkynes. In this protocol, 3-arylpropiolates are selectively reduced to the Z-isomer when the aryl ring bears an electron-donor substituent, whereas 3-arylpropynones are reduced to the E-isomers.
A synthesis of highly substituted alkenylphosphines by Lewis acid-mediated silylphosphination of substituted propiolates is described. The addition proceeded smoothly to give the corresponding acrylates, where the phosphino group attached at the β and the silyl group located at the α position of the resulting acrylate, in exclusively syn-stereochemistry.