Catalytic highly asymmetric 1,5(6)-selective cyclization reaction of α-hydroxyimino cyclic ketones: direct approach to ring-fused hydroxyimino dihydropyrans.
Org Biomol Chem
; 11(32): 5222-5, 2013 Aug 28.
Article
em En
| MEDLINE
| ID: mdl-23846347
ABSTRACT
Herein, we have disclosed a catalytic asymmetric 1,5(6)-selective Michael/cyclization reaction of α-hydroxyimino cyclic ketones with γ,ß-unsaturated α-keto esters. Unlike the previous catalytic strategies, this reaction provides a convenient 1,5(6)-selective asymmetric pathway to access synthetically useful ring-fused dihydropyrans. In general, high levels of yield, enantio- and diastereoselectivity (up to 99% yield, >99% ee and >20 1 dr) were obtained.
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01-internacional
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MEDLINE
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Oximas
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Idioma:
En
Ano de publicação:
2013
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Article