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Beilstein J. Org. Chem. 2010, 6, No. 75, doi:10.3762/bjoc.6.75
Graphical Abstract
Scheme 1: Synthesis of 3,6-dihydro-2H-pyrans D.
Scheme 2: Addition of lithiated enol ether 1a to nitrone 2c/Et2AlCl.
Scheme 3: Mechanistic proposal for the transformation of syn-4a into cis-5a in the presence of TMSOTf.
Scheme 4: Unsuccessful attempt to cyclize hydroxylamine derivative syn-4f.
Scheme 5: Functionalizations of the enol ether moiety of cis-5a leading to compounds 8–11.
Scheme 6: Transformations of the enol ether moiety of trans-5a leading to products 13–15.
Scheme 7: Bromination of bicyclic dihydropyran trans-5b affording 16.
Scheme 8: Synthesis of epoxypyran 18 by bromination of cis-5d.
Scheme 9: Oxidative cleavage of dihydropyran 19 to lactone 20.
Scheme 10: Transformation of α-bromoketone 15 into nitrone 21 by an internal redox reaction.
Scheme 11: Transformation of α-bromoketone 11 into nitrone 21.
Scheme 12: Synthesis of diastereomeric aminopyrans 24 and 26.
Scheme 13: Synthesis of diastereomeric aminopyrans 28 and 30.
Scheme 14: Synthesis of triamides 31 and 32.