77317-06-7Relevant articles and documents
Visible-light induced enhancement in the multi-catalytic activity of sulfated carbon dots for aerobic carbon-carbon bond formation
Sarma, Daisy,Majumdar, Biju,Sarma, Tridib K.
, p. 6717 - 6726 (2019/12/26)
The development of carbonaceous materials as metal-free catalysts integrating different types of catalysis in a single system represents a significant advance in cascade/tandem organic synthesis. Zero-dimensional carbon dots with tuneable optical properties and easily modifiable surface functionalities can be harnessed as a carbocatalyst for merging photooxidation and acid-catalyzed reactions in one pot. Herein, we explore carbon dots decorated with hydrogen sulfate groups as a photocatalyst for the dehydrogenative cross-coupling of xanthenes with ketones, arenes and 1,3-dicarbonyl compounds that showed high efficiency and selectivity under visible-light irradiation. The sulphated carbon dots demonstrate dual catalytic properties, wherein they induced the rapid photooxidation of xanthenes in the presence of molecular oxygen to form a hydroperoxy intermediate followed by coupling of nucleophiles catalysed by the acidic surface functional groups. The methodology represents an operationally simple pathway for the generation of C-C coupling products in a short reaction time with wide substrate scopes under mild conditions. The catalyst is easily separable and can be reused over multiple cycles with good efficiency.
Structurally diverse α-substituted benzopyran synthesis through a practical metal-free C(sp3)-H functionalization
Chen, Wenfang,Xie, Zhiyu,Zheng, Hongbo,Lou, Hongxiang,Liu, Lei
supporting information, p. 5988 - 5991 (2015/01/08)
A trityl ion-mediated practical C-H functionalization of a variety of benzopyrans with a wide range of nucleophiles (organoboranes and C-H molecules) at ambient temperature has been disclosed. The metal-free reaction has an excellent functional group tole
Synthesis of Carbocyclic Spiro Compounds from Isochroman Derivatives via Intramolecular Aldol Reaction
Hashigaki, Kuniko,Yoshioka, Sabroh,Yamato, Masatoshi
, p. 1004 - 1007 (2007/10/02)
Condensation of 1-ethoxyisochromans with cyclohexanones, 1-indanone, or 1-tetralone in the presence of boron trifluoride etherate affords α-(isochroman-1-yl)-cyclic ketones.Reductive ring cleavage of the isochromanyl moiety followed by Jones oxidation yie