A Multicomponent Coupling Reaction Induced by Insertion of Arynes into the CO Bond of Formamide
作者:Eito Yoshioka、Shigeru Kohtani、Hideto Miyabe
DOI:10.1002/anie.201102088
日期:2011.7.11
And aryne makes three: The three‐component coupling of arynes, DMF, and active methylenes has provided an efficient method for the synthesis of 2H‐chromene and coumarin derivatives (see scheme). The sequential multistep reactions are driven by the release of strain energy in the arynes and intermediates, and this finding was supported by thermodynamics.
KRAUS G. A.; PEZZANITE J. O., J. ORG. CHEM., 1979, 44, NO 14, 2480-2482
作者:KRAUS G. A.、 PEZZANITE J. O.
DOI:——
日期:——
Three-Component Coupling Reactions of Arynes for the Synthesis of Benzofurans and Coumarins
作者:Eito Yoshioka、Shigeru Kohtani、Hideto Miyabe
DOI:10.3390/molecules19010863
日期:——
The domino three-component coupling reaction of arynes with DMF and active methylenes or methines was studied as a highly efficient method for preparing heterocycles. Coumarinderivative 5 was formed when diethylmalonate (2) or α-bromomalonate (3) were used as a C2-unit. In contrast, dihydrobenzofurans 7a and 7b were obtained by using α-chloroenolates generated from α-chloromalonates 4a and 4b and
Access to Highly Strained Tricyclic Ketals Derived from Coumarins
作者:Sravan K. Jonnalagadda、Bader I. Huwaimel、Shirisha Jonnalagadda、Jered C. Garrison、Paul C. Trippier
DOI:10.1021/acs.joc.2c00018
日期:2022.3.18
Synthesis of highly strained fused substituted dihydrobenzopyran cyclopropyl lactones derived fromcoumarin carboxylates are reported. The substrate scope tolerates a variety of 6- and 8-substituents on the coumarin ring. Substitution at the 5- or 7-position is resistant to tricyclic lactone formation except with 7-methyl substitution. Benzamide-containing coumarins afford the tricyclic ketal. A plausible