Highly regioselective synthesis of 2,3-disubstituted 2 H -1-benzopyrans: Brønsted acid catalyzed [4+2] cycloaddition reaction with a variety of arylalkynes via ortho -quinone methides
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2008 ◽
Vol 130
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pp. 7449-7458
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Vol 18
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pp. 6470-6474
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Vol 84
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pp. 7175-7188
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Vol 53
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pp. 7923-7927
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