Montmorillonite K-10 clay-catalyzed Ferrier rearrangement of 2-C-hydroxymethyl-d-glycals, 3,4,6-tri-O-alkyl-d-glycals, and 3,4-(dihydro-2H-pyran-5-yl)methanol: a few unexpected domino transformations
作者:Elumalai Kumaran、Meenakshisundaram Santhi、Kalpattu K. Balasubramanian、Shanmugasundaram Bhagavathy
DOI:10.1016/j.carres.2011.03.027
日期:2011.9
3-b]benzopyrans. This montmorillonite K-10 clay-catalyzed transformation is facile both under ambient (Method 1) and microwave conditions (Method 2). Ferrier rearrangement of 3,4-(dihydro-2H-pyran-5-yl)methanol with p-cresol, 2,6-xylenol, and ethanol led to totally unexpected transformations. Reaction of 2-C-hydroxymethyl-d-galactal with 2,6-dimethylphenol in the presence of montmorillonite K-10 led to a novel
蒙脱石K-10粘土催化的3,4,6-三-O-烷基-2-C-羟甲基-d-糖基,3,4,6-三-O-乙酰基-d-糖基,3,描述了4,6-三-O-烷基-d-糖和3,4-(二氢-2H-吡喃-5-基)甲醇与少量醇和酚。2-C-羟甲基-d-缩醛与酚的反应类似于2-C-乙酰氧基甲基-d-缩醛的反应,得到吡喃并[2,3-b]苯并吡喃。这种蒙脱土K-10粘土催化的转化在环境(方法1)和微波条件(方法2)下都很容易。3,4-(二氢-2H-吡喃-5-基)甲醇与对甲酚,2,6-二甲苯酚和乙醇的重排反应导致完全出乎意料的转化。在蒙脱石K-10存在下,2-C-羟甲基-d-半乳糖与2,6-二甲基苯酚的反应导致了新的多米诺骨牌转化,提供了4-(5',6' -二氢-4H-吡喃-3′-基甲基)-2,6-二甲基苯酚。相比之下,3,4,6-三-O-乙酰基-d-葡糖醇提供了Ferrier重排产物,即2,6-二甲基苯基4,6-二-O-乙酰基-2