Switchable Synthesis of Arylalkynes and Phthalides via Controllable Palladium-Catalyzed Alkynylation and Alkynylation–Annulation of Benzoic Acids with Bromoalkynes
palladium(II)-catalyzed synthesis of arylalkynes and phthalides from benzoicacids and bromoalkynes via carboxylate-assisted ortho-C–H activation is reported. A series of phthalides with various functional groups are prepared via ortho-alkynylation and alkynylation–annulation. Moreover, the key ortho-alkynylated products are also obtained by controlling the reaction conditions. In addition, heteroaryl acids could react
A simple and efficient synthesis of isocoumarins and alkylidenephthalides from 3-(1-hydroxycarbethoxy/alkyl)phthalides with a DEAD/PPh<sub>3</sub>/TBHP system
作者:Sunita K. Gadakh、Arumugam Sudalai
DOI:10.1039/c4ra10372f
日期:——
to the synthesis of 3-carbethoxy-isocoumarins and 3-alkylidenephthalides is described. The methodology employs DEAD/PPh3/TBHP as the reagent system proceeding through unprecedented 1,2-shift intramolecular ring expansion or simple elimination depending upon substituents present on 3-substituted phthalides, with broader substrate scope. This strategy is amply demonstrated in the short synthesis of bioactive
3-Ylidenephthalides as a new class of transient receptor potential channel TRPA1 and TRPM8 modulators
作者:Giorgio Ortar、Aniello Schiano Moriello、Enrico Morera、Marianna Nalli、Vincenzo Di Marzo、Luciano De Petrocellis
DOI:10.1016/j.bmcl.2013.08.039
日期:2013.10
Following the recent identification of the naturally occurring 3-ylidene-4,5-dihydrophthalide ligustilide and its oxidation product dehydroligustilide as novel TRPA1 modulators, a series of seventeen 3-ylide-nephthalides was synthesized and tested on TRPA1 and TRPM8 channels. Most of these compounds acted as strong modulators of the two channel types with EC50 and/or IC50 values distinctly lower than those of the reference compounds. (C) 2013 Elsevier Ltd. All rights reserved.
A new synthesis of 3-ylidenephthalides via palladium-catalyzed cyclocarbonylation of 2-triflyloxyacetophenones
作者:Pier Giuseppe Ciattini、Gaia Mastropietro、Enrico Morera、Giorgio Ortar
DOI:10.1016/s0040-4039(00)79222-7
日期:1993.6
The reaction of 2-triflyloxyacetophenone derivatives 1 with carbon monoxide in the presence of a palladium catalyst affords 3-ylidenephthalides 2 in good yields and under mild conditions.