Bioactive sulfoximines: Syntheses and properties of Vioxx® analogs
摘要:
The syntheses and biological profiles of sulfoximine-based Vioxx (R) analogs 2 are described. Interesting data have been obtained for 2a, which shows a selective COX-2 inhibition (albeit not as strong as Vioxx (R) itself) exhibiting reduced hERG activity compare to the parent sulfone Vioxx (R) (1). (C) 2011 Elsevier Ltd. All rights reserved.
In the present study reports 1,3‐dipolar cycloaddition reactions starting from easily accessible N‐cyanosulfoximines. In a straightforward manner, sulfoximines with N‐1,2,4‐triazolyl and N‐1,2,4‐oxadiazolyl substituents are prepared in good yields, While the former reactions require the presence of Yb(OTf)3 in catalytic amounts, the latter proceed metal‐free.
At elevated temperatures, N-cyanosulfoximines react with Meldrum’s acidderivatives to give sulfoximines with N-bound 5-carbonyl-1,3-oxazine-2,4-dione groups. A representative product was characterized by single-crystal X-ray structure analysis. The product formation involves an unexpected molecular reorientation requiring several sequential bond-forming and -cleaving processes.