267901-33-7Relevant articles and documents
Ag2Cr2O7 nanoparticles: An eco-friendly and reusable catalyst for synthesis of pyrano[c]chromenediones and [1,3]dioxolo[g]chromeneones in aqueous media at ambient temperature
Ebrahimi, Mitra,Abdolmohammadi, Shahrzad,Kia-Kojoori, Reza
, p. 1895 - 1902 (2020/05/25)
An efficient and green protocol for the synthesis of 4-aryl-3,4-dihydro-2H,5H-pyrano[3,2-c]chromene-2,5-diones and 8-aryl-7,8-dihydro-6H-[1,3]dioxolo[4,5-g]chromene-6-ones through the Ag2Cr2O7 nanoparticles catalyzed cyclo
Molecular iodine catalyst promoted synthesis of chromans and 4-aryl-3,4-dihydrobenzopyran-2-ones via [3+3] cyclocoupling
Naik, Mayuri M.,Kamat, Durga P.,Tilve, Santosh G.,Kamat, Vijayendra P.
, p. 5221 - 5233 (2014/07/08)
Molecular iodine as an inexpensive catalyst is described in the construction of 2-substituted or 2,2-disubstituted chromans and 4-aryl-3,4-dihydrobenzopyran-2-ones via [3+3] cyclocoupling. For the synthesis of chromans, phenols and allylic alcohols were refluxed in chloroform in presence of 20 mol % I2 while [3+3] cyclocoupling of phenols and cinnamic acids proceeded to give 4-aryl-3,4-dihydrobenzopyran-2-ones using 30 mol % I2. Later reaction occurs via a tandem hydroarylation- esterification process at 120-130°C under solvent free conditions. Chromans were obtained in 20-92% yields and substituted 4-aryl-3,4-dihydrobenzopyran-2- ones were obtained in 5-85% yields.
Sulfonic-acid-functionalized silica: An efficient, heterogeneous and reusable catalyst for the synthesis of 8-aryl-7,8-dihydro-[1,3]dioxolo [4,5-g]chromen-6-ones
Li, Weilin,Wu, Liqiang,Yan, Fulin
experimental part, p. 725 - 728 (2012/07/28)
Sulfonic-acid-functionalized silica was used as an efficient and recyclable catalyst for the one-pot synthesis of 8-aryl-7,8-dihydro-[1,3]dioxolo[4,5-g] chromen-6-ones with the help of 3,4-methylenedioxyphenol, aldehydes and Meldrums' acid. Different type
