One-Pot Allylation–Intramolecular Vinylogous Michael Addition–Isomerization Cascade of <i>o</i>-Hydroxycinnamates and Congeners: Synthesis of Substituted Benzofuran Derivatives
intramolecular vinylogous Michael addition leading to the synthesis of heterocycles has been disclosed. Base-promoted one-pot sequential O-allylation of o-hydroxy-cinnamates or -cinnamonitrile or -chalcones with γ-bromocrotonates followed by an intramolecular conjugate addition of vinylogous Michael donors resulted in the formation of highly substituted benzofuran derivatives in good to excellent yields. The intramolecular
Harikrishna, G.; Hariprasad, K. Siva; Raju, B. China, Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 2021, vol. 60, # 1, p. 111 - 116
作者:Harikrishna, G.、Hariprasad, K. Siva、Raju, B. China、Tiwari, A. K.、Zehra, A.
DOI:——
日期:——
Task-Specific Ionic Liquid as Reagent and Reaction Medium for the One-Pot Horner–Wadsworth–Emmons–Type Reaction Under Microwave Irradiation
作者:Hassan Valizadeh、Abbas Shockravi
DOI:10.1080/00397910902898650
日期:2009.11.18
A task-specific imidazolium-based phosphinite ionic liquid (IL-OPPh2) was used as the dual solvent-reagent for the synthesis of E-cinamates and coumarin derivatives via the one-pot Horner-Wadsworth-Emmons-type reaction. The ionic liquid containing its corresponding phosphinite moiety was reacted with a-chloro esters and benzaldehyde or salicylaldehyde derivatives in the presence of sodium methoxide under microwave irradiation to produce the related E-cinamates or coumarins, respectively. The satisfactory results were obtained with good yields, short reaction time, and simple experimental procedure.
TUCKER H., J. MED. CHEM., 1980, 23, NO 10, 1122-1126