Base-free regio- and stereoselective photochemical synthesis of enol ethers from 1,3-dicarbonyl compounds

Difluorocarbene/H2O Serving as a CO2 Equivalent for Insertion into Oxiranes

A difluorocarbene-enabled regioselective C(sp3)-O bond cleavage of oxiranes has been developed. The protocol provides an efficient and practical approach to cyclic carbonates under mild conditions. Significantly, the generation of difluorocarbene with BrCF2CO2Et/H2O serving as a CO2 equivalent under metal-free conditions has been disclosed.

Violet-Light-Induced Ring-Opening of Anthranils with Chlorodiazirines

A violet-light-induced ring-opening of anthranils with chlorodiazirines has been developed. The metal-free protocol provides a rapid and efficient approach to N-(2-carbonylaryl)benzamides in moderate to good yields under mild conditions. The reaction appears to involve α-chlorocarbenes, which trigger the ring-opening of anthranils.

Dioxane promoted photochemical O-alkylation of 1,3-dicarbonyl compounds beyond carbene insertion into C-H and C-C bonds

A photochemical synthesis of enol ethers and furan-3(2H)-ones from 1,3-dicarbonyl compounds and aryl diazoacetates has been developed. Significantly, 1,4-dioxane promoted O-alkylation of various 1,3-dicarbonyl compounds beyond previous carbene insertion into C-H and C-C bonds has been disclosed.