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• W1981419394 abstract "Imines 1a and 1b react with dihydrofuran (DHF) under Lewis acid catalysis via Diels–Alder-type addition to form the tetrahydroquinoline derivatives 3a, b and 4a, b. Besides these compounds, the methanol adduct 2 of 1a, or 1a in the presence of methanol, gives the methanol-containing tetrahydrofuran derivative 7a and the hexahydrofuro[3,2-b]furan derivatives 5 and 6. In the presence of methanol, 1b gives 3b and 4b, and also 7b and 8. The products 3a, b, 5, 6 and 7a, b originate from approach of the Si(or Re) face of 1a, b onto the Si(or Re) face of DHF; 4a, b and 8 derive from interaction of the Si(or Re) face of 1a, b with the Re(or Si) face of DHF. The dependence of the product distribution on the polarity of the solvent suggests that a concerted mechanism predominates in the former mode and a zwitterionic one in the latter. In the addition of 1a or 2 the mechanistic preference may be exclusive." @default.
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• W1981419394 date "1992-01-01" @default.
• W1981419394 modified "2023-10-12" @default.
• W1981419394 title "Acid-catalysed addition of N-aryl imines to dihydrofuran. Postulated dependence of the reaction mechanism on the relative face of approach of reactants" @default.
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• W1981419394 doi "https://doi.org/10.1039/p29920000259" @default.
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