Fe/S-Catalyzed synthesis of 2-benzoylbenzoxazoles and 2-quinolylbenzoxazoles <i>via</i> redox condensation of <i>o</i>-nitrophenols with acetophenones and methylquinolines
作者:Le Anh Nguyen、Thi Thu Tram Nguyen、Quoc Anh Ngo、Thanh Binh Nguyen
DOI:10.1039/d1ob00976a
日期:——
An Fe/S catalyst generated in situ from FeCl2·4H2O and elemental sulfur S8 in the presence of a tertiary amine as a base was found to catalyze efficiently a 6e− redox condensation of o-nitrophenols with acetophenones and methylquinolines. The condensed products 2-benzoylbenzoxazoles and 2-quinolylbenzoxazoles were obtained in reasonable yields with water as the only byproduct at a temperature as low
发现在叔胺作为碱存在下由 FeCl 2 ·4H 2 O 和元素硫 S 8原位生成的 Fe/S 催化剂可有效催化邻硝基苯酚与苯乙酮和甲基喹啉的 6e -氧化还原缩合反应。缩合产物 2-苯甲酰基苯并恶唑和 2-喹啉基苯并恶唑在低至 80 °C 的温度下以合理的收率获得,水作为唯一的副产物。
Room-temperature palladium-catalyzed direct 2-arylation of benzoxazoles with aryl and heteroaryl bromides
作者:Feng Gao、Byeong-Seon Kim、Patrick J. Walsh
DOI:10.1039/c4cc05307a
日期:——
The first room-temperature direct 2-arylation of benzoxazoles with aryl bromides by a Pd(OAc)2/NiXantphos-based catalyst is reported.
Iron Sulfide Catalyzed Redox/Condensation Cascade Reaction between 2-Amino/Hydroxy Nitrobenzenes and Activated Methyl Groups: A Straightforward Atom Economical Approach to 2-Hetaryl-benzimidazoles and -benzoxazoles
Iron sulfide generated in situ from elemental sulfur and iron was found to be highly efficient in catalyzing a redox/condensation cascade reaction between 2-amino/hydroxy nitrobenzenes and activated methyl groups. This method represents a straightforward and highly atom economical approach to 2-hetaryl-benzimidazoles and -benzoxazoles.
US9246108B2
申请人:——
公开号:US9246108B2
公开(公告)日:2016-01-26
Synthesis of hetaryl-substituted benzoxazoles<i>via</i>oxidative cyclization of phenolic schiff's bases
作者:Kadri G. Ozokan、Mustafa K. Gumus、Seniz Kaban
DOI:10.1002/jhet.5570450643
日期:2008.11
2-(1H-Pyrrol-2-yl)benzo[d]oxazoles, 4-(benzo[d]oxazol-2-yl)quinoline and 2-(benzo[d]oxazol-2-yl)-4,6-dimethylquinolines were obtained in good yield by the oxidative intramolecular ring closing reactions of phenolicSchiff'sbases with the effect of manganese triacetate.
2-(1 H-吡咯-2-基)苯并[ d ]恶唑,4-(苯并[ d ]恶唑-2-基)喹啉和2-(苯并[ d ]恶唑-2-基)-4,6通过酚类席夫碱的氧化性分子内闭环反应和三乙酸锰的作用,可以得到高产率的-二甲基喹啉。