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[4 + 2] Cyclization of para-Quinone Methide Derivatives with Alkynes

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journal contribution
posted on 11.01.2018, 00:00 by Guang-Jian Mei, Shao-Li Xu, Wen-Qin Zheng, Chen-Yu Bian, Feng Shi
The first cyclization of para-quinone methide derivatives with alkynes was established by utilizing the [4 + 2] reaction of ortho-hydroxyphenyl-substituted para-quinone methides with ynones or benzyne, which efficiently constructed the scaffolds of chromene and xanthene in high yields (up to 88%). This protocol has not only fulfilled the task of developing cyclization reactions of para-quinone methide derivatives but also provided an efficient method for constructing chromene and xanthene scaffolds.