Multicomponent Condensation Reactions via ortho-Quinone Methides.
Multicomponent Condensation Reactions via ortho-Quinone Methides.
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DOI:
10.1021/acs.orglett.7b00647
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发表时间:
2017-04-07
期刊:
影响因子:
5.2
通讯作者:
Schaus SE
中科院分区:
文献类型:
--
作者:
Allen EE;Zhu C;Panek JS;Schaus SE
Iron(III) salts promote the condensation of aldehydes or acetals with electron-rich phenols to generate ortho-quinone methides that undergo Diels—Alder condensations with alkenes. The reaction sequence occurs in a single vessel to afford benzopyrans in up to 95% yield. The reaction was discovered while investigating a two-component strategy using 2-(hydroxy(phenyl)methyl)phenols to access the desired ortho-quinone methide in a Diels—Alder condensation. The two-component condensation also afforded the corresponding benzopyran products in yields up to 97%. Taken together, the two- and three-component strategies using ortho-quinone methide intermediates provide efficient access to benzopyrans in good yields and selectivities.
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