π-Expanded Coumarins: One-Pot Photo Synthesis of 5H-Benzo[12,1]tetrapheno[7,6,5-cde]chromen-5-ones and Photophysical Properties
摘要:
The synthesis of a unique type of it-expanded coumarin derivatives, bearing six fused phenyl rings, was achieved via one-pot Suzuki reaction and visible light-driven electrocyclization. The large it-expanded 5H-benzo[12,1]tetrapheno[7,6,5]chromen-5-ones were obtained in good to high yields from 1-bromo-2H-phenaleno[1,2,3-de]chromen-2-ones, and the intriguing optical properties were explored by altering the attached functional groups. 2-Arylaminosubstituted-5H-benzo[12,1]tetrapheno[7,6,5-cddchromen-5-ones showed a large Stokes shift (4005 cm(-1)) or excellent fluorescence quantum yield (Phi(f) = 0.75) along with significant bathochromic shift in tetrahydrofuran.
Copper/Selectfluor-System-Catalyzed Dehydration-Oxidation of Tertiary Cycloalcohols: Access to β-Substituted Cyclohex-2-enones, 4-Arylcoumarins, and Biaryls
作者:Shaobo Ren、Jian Zhang、Jiahui Zhang、Heng Wang、Wei Zhang、Yunkui Liu、Miaochang Liu
DOI:10.1002/ejoc.201500610
日期:2015.8
A route to β-substitutedcyclohex-2-enones, 4-arylcoumarins, and biaryls has been developed. This approach involves a one-pot Cu0/Selectfluor-catalyzed dehydration–oxidation of tertiary cycloalcohols. Thus, by using 2 equiv. of Selectfluor at 25 °C, the dehydration–oxidation of tertiary cyclohexanols and oxabenzocyclohexanols gave β-substitutedcyclohex-2-enones and 4-arylcoumarins, respectively; whereas
4-Stannylcoumarins as Useful Reagents in a New Approach to Neoflavonoids
作者:Pier Giuseppe Ciattini、Enrico Morera、Giorgio Ortar
DOI:10.1080/00397919508011837
日期:1995.9
Abstract 4-Trimethylstannylcoumarins 2, conveniently obtained from the corresponding 4-triflyloxycoumarins 1, undergo Pd(0)/CuI-cocatalyzed cross-coupling reactions with a variety of aryl iodides to afford 4-arylcoumarins 4 in moderate to good yields. Aryl triflates are less effective as coupling partners.
Palladium‐Catalyzed Cross‐Coupling of Alkenyl Carboxylates
作者:Joseph Becica、Oliver R. J. Heath、Cameron H. M. Zheng、David C. Leitch
DOI:10.1002/anie.202006586
日期:2020.9.21
desirable features as electrophiles for catalytic cross‐coupling: they are easy to access, robust during multistep synthesis, and mass‐efficient in coupling reactions. Alkenyl carboxylates, a class of readily prepared non‐aromatic electrophiles, remain difficult to functionalize throughcross‐coupling. We demonstrate that Pd catalysis is effective for coupling electron‐deficient alkenyl carboxylates with
Coumarin compounds and method for preparing and using the same
申请人:Lin Guoqiang
公开号:US20060063806A1
公开(公告)日:2006-03-23
4-Substituted coumarin compounds having the general formula of
where R is H, CHO, OCH
3
, X, NO
2
, an alkyl having C
1-10
, —OCH
2
O—, an aryl being mono- or poly-substituted with CN or COOCH
3
with the aryl being a phenyl, naphthyl, or azaryl, or a coumarin group
that is substituted with R
1
, R
2
, R
3
, R
4
, with R
1
, R
2
, R
3
, and R
4
being H, an alkyl having C
1-10
, X, NO
2
, CN, OCH
3
, COOCH
3
or OR
5
, R
5
being H or an alkyl having C
1-10
, and X being a halogen.