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Beilstein J. Org. Chem. 2017, 13, 571–578, doi:10.3762/bjoc.13.56
Graphical Abstract
Figure 1: The chroman-based antihypertensive drug nebivolol, its biologically active stereoisomers and late-s...
Scheme 1: Synthetic strategies toward late-stage intermediates of 1a.
Scheme 2: Attempted synthesis of (±)-2 via intramolecular SNAr reaction.
Scheme 3: Speculation on the synthesis of a 2-substituted chroman derivative based on Borhan’s approach.
Scheme 4: Synthesis of syn-2,3-dihydroxy esters 19 and 20.
Scheme 5: Attempted cyclization according to Borhan’s method.
Scheme 6: Synthesis of β-hydroxy-α-tosyloxy esters 24 and 25.
Scheme 7: Speculation of simultaneous epoxidation/epoxide-ring opening.
Scheme 8: Synthesis of chroman diols 2 and 29, respectively.
Scheme 9: Conversion of 32 into 3 via Mitsunobu inversion.
Scheme 10: Synthesis of chroman epoxide 5.
Beilstein J. Org. Chem. 2016, 12, 2816–2822, doi:10.3762/bjoc.12.280
Figure 1: Chroman-based tetracyclic natural products 1–4 of the brazilin family and our designed, B-ring-modi...
Scheme 1: Retrosynthetic analysis of the designed B-ring-modified analogues of brazilin.
Scheme 2: The synthetic challenge associated with the synthesis of 5 by IFCEA of 6 (above) and recent literat...
Figure 2: Assessment of the IFCEA cyclization on additional substrates (±)-6b–n leading to (±)-5b–n. Reaction...
Figure 3: ORTEP diagram of 5k.
Scheme 3: Stereoselective conversion of (±)-5k into (±)-14.