Selective α-Methylation of Aryl Ketones Using Quaternary Ammonium Salts as Solid Methylating Agents
作者:Johanna Templ、Michael Schnürch
DOI:10.1021/acs.joc.1c03158
日期:2022.3.18
We describe the use of phenyl trimethylammonium iodide (PhMe3NI) as an alternative methylatingagent for introducing a CH3 group in α-position to a carbonyl group. Compared to conventional methylatingagents, quaternary ammonium salts have the advantages of being nonvolatile, noncancerogenic, and easy-to-handle solids. This regioselective method is characterized by ease of operational setup, use of
Synthesis of some tetrahydronaphthyl- and flavanyl-coumarins
作者:Roy S. Shadbolt、David R. Woodward、Peter J. Birchwood
DOI:10.1039/p19760001190
日期:——
The synthesis is described of a number of 3-[3-(p-substituted phenyl)-1,2,3,4-tetrahydro-1-naphthyl]-4-hydroxycoumarins (7) and 3-(4′-substituted flavan-4-yl)-4-hydroxycoumarins (17), many of which show outstanding activity as anticoagulants against both Warfarin-resistant rats. The final stage in the syntheses involves the reaction of either 3-(p-substituted phenyl)-1,2,3,4-tetrahydro-1-naphthols