Novel synthesis of 2,2-dialkyl-3-dialkylamino-2,3-dihydro-1H-naphtho[2,1-b]pyrans
作者:Po-Jung Jimmy Huang、T. Stanley Cameron、Amitabh Jha
DOI:10.1016/j.tetlet.2008.10.083
日期:2009.1
(retro-aldol product). This Mannich base then disproportionates into a quinone methide intermediate and the secondary amine is regenerated. It then forms an enamine intermediate with 2,2-dialkylacetaldehyde (another retro-aldol product). Finally, the quinone methide intermediate undergoes electrocyclic ring closure with enamines to produce the title compounds.
由2-萘酚,仲胺和3-羟基-2,2-二烷基丙醛制备2,2-二烷基-3-二烷基氨基-2,3-二氢-1 H-萘并[ 2,1- b ]吡喃。催化量p的存在-甲苯磺酸。该一锅法反应涉及3-羟基-2,2-二烷基丙醛的逆醛醇缩合,然后由2-萘酚,仲胺和甲醛(逆醛醇产物)形成曼尼希碱中间体。然后,该曼尼希碱歧化成醌甲基化物中间体,并再生仲胺。然后,它与2,2-二烷基乙醛(另一种逆醛醇产物)形成烯胺中间体。最后,醌甲基化物中间体与烯胺经历电环闭合以产生标题化合物。