Hypophosphorous acid–iodine: a novel reducing system. Part 2: Reduction of benzhydrols to diarylmethylene derivatives
作者:Paul E Gordon、Albert J Fry
DOI:10.1016/s0040-4039(00)02159-6
日期:2001.1
A mixture of hypophosphorousacid (H3PO2) and iodine in acetic acid reduces a variety of substituted benzhydrols to the corresponding methylene derivatives in very high yields. The active reducing agent is hydrogen iodide generated by reactionbetweeniodine and hypophosphorousacid.
次磷酸(H 3 PO 2)和碘在乙酸中的混合物可以以很高的产率将各种取代的苯氢酚还原为相应的亚甲基衍生物。活性还原剂是碘与次磷酸反应生成的碘化氢。
Synthesis of Fluorenone Derivatives through Pd-Catalyzed Dehydrogenative Cyclization
作者:Hu Li、Ru-Yi Zhu、Wen-Juan Shi、Ke-Han He、Zhang-Jie Shi
DOI:10.1021/ol302181z
日期:2012.9.21
Palladium-catalyzed dual C–H functionalization of benzophenones to form fluorenones by oxidative dehydrogenative cyclization is reported. This method provides a concise and effective route toward the synthesis of fluorenone derivatives, which shows outstanding functional group compatibility.
Benzylation of β-dicarbonyl compounds and 4-hydroxycoumarin using TMSOTf catalyst: a simple, mild, and efficient method
作者:Palani Theerthagiri、Appaswami Lalitha
DOI:10.1016/j.tetlet.2010.08.019
日期:2010.10
The direct benzylation of 1,3-dicarbonyl compounds and 4-hydroxycoumarin with a wide variety of benzylic alcohols was achieved using trimethylsilyl trifluoromethanesulfonate as an efficient catalyst. The reaction proceeded under very mild conditions at room temperature providing the desired products in good to excellent yields.
One-pot synthesis of indene derivatives by CF3SO3H-promoted reactions of benzylic alcohols and 1,3-dicarbonyl compounds
作者:Wenxue Zhang、Yisi Dai、Haizhen Zhu、Wei Zhang
DOI:10.1016/j.tetlet.2013.01.088
日期:2013.3
coupling/cyclization reaction of benzylic alcohols and 1,3-dicarbonyls for the first time. For the reactions of methoxy- or methyl-substituted diarylmethanols with 1,3-dicarbonyls, 2 equiv of CF3SO3H was needed to reach the best results; but for the reactions of methoxy-substituted arylethanols with 1,3-dicarbonyls, 0.6 equiv of CF3SO3H at lower temperatures was capable of promoting the reaction finished.
首次通过CF 3 SO 3 H促进的苄醇与1,3-二羰基的偶联/环化反应,以中等至高收率实现了茚满衍生物的高效便捷的一锅合成。对于甲氧基或甲基取代的二芳基甲醇与1,3-二羰基的反应,需要2当量的CF 3 SO 3 H才能达到最佳效果。但是对于甲氧基取代的芳基乙醇与1,3-二羰基的反应,在较低温度下0.6当量的CF 3 SO 3 H能够促进反应的完成。