dihydropyrano[3,2-b]indole, had been much less explored. Herein, the highly diastereoselective [3 + 3] cycloaddition of indolin-3-ones with nitroallylic acetates were developed for the efficient synthesis of a series of polysubstituted dihydropyrano[3,2-b]indoles in good to high yields with exclusive diastereoselectivities. Different from previous reports, this approach employed a base-promoted cycloaddition
二氢
吡喃并 [2,3- b ]
吲哚是一种特殊的二氢
吲哚基序,而其类似物二氢
吡喃并 [3,2- b ]
吲哚则鲜为人知。在此,开发了 indolin-3-one 与硝基
烯丙基乙酸酯的高度非对映选择性 [3 + 3] 环加成,用于高效合成一系列多取代的二氢
吡喃并 [3,2- b]
吲哚,产率高,具有独特的非对映选择性。与之前的报道不同,该方法采用碱基促进的环加成策略来组装具有药理学意义的二氢
吡喃并 [3,2- b ]
吲哚支架。