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Synthesis 2011(12): 1887-1895
DOI: 10.1055/s-0030-1260469
DOI: 10.1055/s-0030-1260469
PAPER
© Georg Thieme Verlag
Stuttgart ˙ New York
Organocatalytic Domino Double Michael Reaction of Ethyl (E)-7-Oxohept-2-enoate and α,β-Unsaturated Aldehydes: Efficient Asymmetric Synthesis of Cyclohexanes with Four Contiguous Stereocenters
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Publikationsverlauf
Received
14 March 2011
Publikationsdatum:
16. Mai 2011 (online)


Abstract
Organocatalytic domino double Michael reactions of ethyl (E)-7-oxohept-2-enoate and α,β-unsaturated aldehydes provided ethyl 2-(2,4-diformyl-3-phenylcyclohexyl)acetate with excellent diastereoselectivities (>20:1 dr) and enantioselectivities (>99% ee). The adducts were further transformed to octahydro-3H-2-benzopyran-3-ones, octahydroisoquinolin-3(2H)-ones, and decahydro-5H-oxazolo[2,3-a]isoquinolin-5-ones.
Key words
Michael addition - aldehydes - organocatalysis - aldol reaction - quinolines
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