Synthesis of a new series of pyrazolo[1,5-<i>a</i>]pyrimidines structurally related to zaleplon
作者:Pier Giovanni Baraldi、Francesca Fruttarolo、Mojgan Aghazadeh Tabrizi、Romeo Romagnoli、Delia Preti、Ennio Ongini、Hussein El-Kashef、María Dora Carrión、Pier Andrea Borea
DOI:10.1002/jhet.5570440212
日期:2007.3
The reaction between 3-(dimethylamino)/3,3-bis(methylthio)-1-(substituted)prop-2-en-1-ones and 4-substituted-5-amino-1H-pyrazoles afforded new pyrazole[1,5-a]pyrimidinesstructurallyrelated to Zaleplon. The chemical modifications introduced at the 3-, 5-, and 7-positions of the bicyclic structure revealed new promising candidates for the treatment of sleep disorders.
Efficient Organocatalytic Dual Activation Strategy for Preparing the Versatile Synthons (2E)-1-(Het)Aryl/styryl-3-(dimethylamino)prop-2-en-1-ones and α-(E)-[(Dimethylamino)methylene]cycloalkanones
A novel organocatalytic dual activation strategy is reported for an efficient synthesis of the versatile synthons (2E)-1-aryl/heteroaryl/styryl-3-(dimethylamino)prop-2-en-1-ones and α-(E)-[(dimethylamino)methylene]cycloalkanones. 2-Guanidinoacetic acid (10 mol%) serves as an ambifunctional organocatalyst for the reaction of various aryl/heteroaryl/styryl methyl ketones and cyclic ketones having an
TORLEY, LAWRENCE W.;JOHNSON, BERNARD D.;DUSZA, JOHN P.
作者:TORLEY, LAWRENCE W.、JOHNSON, BERNARD D.、DUSZA, JOHN P.
DOI:——
日期:——
[2+2] Cycloaddition of electron-poor acetylenes to (E)-3-dimethylamino-1-heteroaryl-prop-2-en-1-ones: synthesis of highly functionalized 1-heteroaroyl-1,3-butadienes
Microwave-assisted [2+2] cycloaddition of (E)-3-dimethylamino-1-heteroaryl-prop-2-en-1-ones to dimethyl acetylenedicarboxylates gives (2E,3E)-dimethyl-2-[(dimethylamino)methylene]-3-(substituted)succinates in 8–91% yield. In the case of a 4,5-dihydrothiazoline derivative, cycloaddition also took place at the endocyclic CN double bond.