N-Heterocyclic Carbene-Catalyzed Hydroacylation of Unactivated Double Bonds
摘要:
An intramolecular N-heterocyclic carbene (NHC)-catalyzed hydroacylation of unactivated double bonds is reported. Systematic variation of the catalyst structure revealed an N-mesitylthiazolylidene annulated with a seven-membered ring to be especially reactive. This NHC enables a unique C-C bond-forming reaction to afford substituted chroman-4-ones in moderate to excellent yields, even ones containing all-carbon quaternary centers.
[EN] 1-PHENYL-SUBSTITUTED HETEROCYCLYL DERIVATIVES AND THEIR USE AS PROSTAGLANDIN D2 RECEPTOR MODULATORS<br/>[FR] DÉRIVÉS HÉTÉROCYCLYLÉS 1-PHÉNYL-SUBSTITUÉS ET LEUR UTILISATION EN TANT QUE MODULATEURS DU RÉCEPTEUR DE LA PROSTAGLANDINE D2
申请人:ACTELION PHARMACEUTICALS LTD
公开号:WO2014006585A1
公开(公告)日:2014-01-09
The present invention relates to 1-phenyl-substituted heterocyclyl derivatives of the formula (I), wherein Y, Z, R1, R2, R3 and R4 are as described in the description and their use as prostaglandin receptor modulators, most particularly as prostaglandin D2 receptor modulators, in the treatment of various prostaglandin-mediated diseases and disorders, to pharmaceutical compositions containing these compounds and to processes for their preparation.
Organophotoredox‐Catalyzed Cascade Radical Annulation of 2‐(Allyloxy)arylaldehydes with
<i>N</i>
‐(acyloxy)phthalimides: Towards Alkylated Chroman‐4‐one Derivatives
作者:Sanju Das、Sushanta Kumar Parida、Tanumoy Mandal、Laxmikanta Sing、Suman De Sarkar、Sandip Murarka
DOI:10.1002/asia.201901735
日期:2020.3.2
approach for the synthesis of highly important 3-alkyl substituted chroman-4-one scaffold is developed using visible light induced radicalcascade cyclization strategy. The reaction is initiated through the generation of alkyl radicals from N-(acyloxy)phthalimides under photoredox conditions, which subsequently undergo intermolecular cascaderadical cyclization on 2-(allyloxy)arylaldehydes to afford chroman-4-one
K<sub>2</sub>S<sub>2</sub>O<sub>8</sub>-Mediated Selective Trifluoromethylacylation and Trifluoromethylarylation of Alkenes under Transition-Metal-Free Conditions: Synthetic Scope and Mechanistic Studies
on and -arylation of alkenes with inexpensive CF3SO2Na and K2S2O8 in aqueous media has been developed, respectively, affording the highly chemoselective synthesis of CF3-functionalized chroman-4-ones and chromanes in satisfactory yields. Control experiments and DFT calculations indicate that the CF3SO2Na/K2S2O8 system is capable of trifluoromethylating the substrate of alkenes without a transition
Alloc=allyloxycarbonyl, Boc=tert‐butyloxycarbonyl). These reactions are the first examples of the formation of medium‐sized rings by the intramolecular cyclopropanation of an alkene with a donor‐substituted rhodium carbenoid, which is not generated from a diazo compound.