The novel pyrrolopyrazines of the general formula ##STR1## wherein one of R.sup.1 and R.sup.2 signifies aryl and the other signifies hydrogen, lower alkyl or aryl or R.sup.1 and R.sup.2 together with the two carbon atoms denoted by .alpha. and .beta. signify the group A; ##STR2## R.sup.3 signifies hydrogen or lower alkyl and R.sup.4 signifies hydrogen or R.sup.3 and R.sup.4 together signify an additional C/N bond; R.sup.5 signifies hydrogen or lower alkyl; R.sup.6 signifies hydrogen or lower alkyl; R.sup.7 signifies hydrogen, halogen, lower alkyl, optionally substituted lower alkoxy, or C.sub.3-6 -cycloalkyl, C.sub.4-6 -cycloalkenyl, C.sub.3-6 -cycloalkyloxy, hydroxy, trifluoro- methanesulphonyloxy or optionally substituted benzyl- oxycarbonyloxy; and the dotted line signifies an optional additional C/C bond, and pharmaceutically acceptable acid addition salts of the compounds of formula I can be used in the control or prevention of illnesses or in the improvement of health, especially in the control or prevention of depressive states, cognitive disorders and neurodegenerative diseases such as Parkinson's disease and Alzheimer's disease.
Dibromo-BODIPY as an Organic Photocatalyst for Radical–Ionic Sequences
作者:William H. García-Santos、Javier Ordóñez-Hernández、Mónica Farfán-Paredes、Hiram M. Castro-Cruz、Norma A. Macías-Ruvalcaba、Norberto Farfán、Alejandro Cordero-Vargas
DOI:10.1021/acs.joc.1c01598
日期:2021.12.3
A new dibrominated 4,4-difluoro-4-bora-3a,4a-diaza-s-indacene (BODIPY) is reported as a new metal-free photocatalyst. This BODIPY showed similar optoelectronic, electrochemical, and performance properties to those of Ru(bpy)3Cl2, one of the most common photocatalysts in a known radical–ionic transformation, such as the formation of 1,4-dicarbonyl compounds. Moreover, additional sequences in which the
Palladium-Catalyzed Carbonylative Cyclization of 1-Iodo-2-alkenylbenzenes
作者:Ei-ichi Negishi、Christophe Copéret、Shengming Ma、Takeshi Mita、Takumichi Sugihara、James M. Tour
DOI:10.1021/ja9533196
日期:1996.1.1
6-membered Type I cyclic acylpalladation products, i.e., α,β-unsaturated cyclicketones, in the absence of an external nucleophile and high yields of 5- and 6-membered Type IIcyclic acylpalladation products, i.e., α- or β-((alkoxycarbonyl)methyl)substituted cyclicketones in the presence of an alcohol, e.g., MeOH. In cases where no such processes are available, other side reactions, such as cyclic carbopalladation