A novel one‐pot [4+2]‐benzannulation approach to substituted carbazoles is accomplished by acid‐catalyzed C3‐propargylation of 2‐alkenyl/aryl indoles with 1‐aryl propargylicalcohols, followed by cycloisomerization. A variety of 2‐alkenylated indoles and 2‐aryl/heteroaryl indoles successfully participated in this tandem reaction with 1‐aryl/heteroaryl propargylicalcohols to provide diversely substituted
An efficient, stereo- and regioselective palladium-catalyzed 6-exo-dig intramolecularhydroarylation of propargyl ethers which provides a concise access to functionalized isochromans in high yields has been developed. A wide range of substrates possessing aromatic, aliphatic and heteroaromatic alkynes can be efficiently transformed into the targeted isochromans. Irrespective of the nature of the substrates
Copper-Mediated Domino Cyclization/Trifluoromethylation of Propargylic <i>N</i>-Hydroxylamines: Synthesis of 4-Trifluoromethyl-4-isoxazolines
作者:Quande Wang、Gavin Chit Tsui
DOI:10.1021/acs.joc.7b03191
日期:2018.3.2
A Cu(OTf)2-mediated synthesis of trifluoromethylated 4-isoxazolines is described. In one step from readily available propargylic N-hydroxylamines, a domino 5-endo-dig cyclization, followed by trifluoromethylation, takes place to construct the 4-isoxazoline core with concomitant installation of the CF3 group at the C-4 position. Such compounds could also be useful precursors for the preparation of α-trifluoromethyl
1-phenyl-3-aryl-2-propyne-1-one useful as calcium uptake inhibitors
申请人:Merrell Dow Pharmaceuticals Inc.
公开号:US05223518A1
公开(公告)日:1993-06-29
This invention relates to 1-phenyl-3-aryl-2-propyne-1-ones, the use of these compounds as calcium uptake inhibitors in leukocytes and thrombocytes, and pharmaceutical compositions containing these compounds as active ingredients, and the process of their preparation.
catalysts, the enantioselective nucleophilicsubstitution reaction at the chiral sp3‐hybridized carbon atom of a racemic electrophile has not been largely explored. Herein, we report the enantioconvergent propargylicsubstitution reaction of racemic propargylicalcohols with thiols using chiral bis‐phosphoric acid as the chiral Brønsted acid catalyst. The substitution products were formed in high yields