Investigation of the multicomponent reaction of 5-hydroxy-2-methyl-4H-pyran-4-one with carbonyl compounds and Meldrum's acid

2-(2-(4-Methoxyphenyl)-4,9-dimethyl-7-oxo-7H-furo[2,3-f]chromen-3-yl)acetic Acid

“…Apparently, this differen to the low reactivity of the coumarin 1 compared with those of the previously hydroxyl derivatives. Wherein, a mixture of hydrochloric and acetic acids is used final similar to the previous works [34][35][36][37][38]. The presented method all to synthesize the target 2-(2-(4-methoxyphenyl)-4,9-dimethyl-7-oxo-7H-f f]chromen-3-yl)acetic acid 4 with a 74% yield.…”

“…A significant advantage of this approach is the ability to obtain target products in one synthetic stage [29][30][31][32][33]. It should be noted that we previously proposed a general approach to the synthesis of condensed furylacetic acids based on the multicomponent reaction of various hydroxyl derivatives with arylglyoxals and Meldrum's acid [34][35][36][37][38]. We assumed that this approach could be used to synthesize substituted furo[2,3-f ]coumarins.…”

Photochemical synthesis and ring–chain–ring tautomerism of benzo[4,5]imidazo[1,2-a]cyclopenta[e]pyridines

“…The starting allomaltols 3 containing the benzimidazole fragment were synthesized from dihydropyranones 21,22 7 and 1,2phenylenediamine 8 by a one-pot telescopic procedure.…”

“…The starting compounds 7 were prepared according to a procedure described previously. 21,22 NMR spectra were recorded with Bruker AM 300 (300 MHz), Bruker AV 400 (400 MHz), Bruker DRX 500 (500 MHz) and Bruker AV 600 (600 MHz) spectrometers in DMSO-d 6 . Chemical shifts ( ppm) are given relative to solvent signals (DMSO-d 6 : 2.50 ppm ( 1 H NMR) and 39.52 ppm ( 13 C NMR)).…”

Photoinduced 6π‐electrocyclization of 2,5‐dichlorothiophene containing benzofuranylacrylonitriles as efficient method for the generation of hydrogen chloride

“…Furthermore, as a result of UV-induced cyclization, a polycyclic product 4q is formed simultaneously with the photogeneration of a hydrogen chloride molecule (Scheme 4). Thus, taking into account the synthetic availability and diversity of 2-arylfuryl-3-acetic acids, [41][42][43][44][45][46][47][48] the proposed approach open access to a wide range of photoacid generators of this type.…”