Xanthone in synthesis: a reactivity profile via directed lithiation of its dimethyl ketal
作者:Michal R. Odrowaz-Sypniewski、Petros G. Tsoungas、George Varvounis、Paul Cordopatis
DOI:10.1016/j.tetlet.2009.08.050
日期:2009.11
Xanthone, as itsdimethylketal, undergoes functionalization with a synthetically useful degree of regioselectivity using a lithiation protocol. The core structure is regenerated during the work-up. Monosubstitution at C-4 or C-1 and disubstitution at C-4 and C-5 or C-1 and C-5 are observed. The substitution pattern appears to be dependent upon the experimental conditions.
The invention is directed to compounds of Formula (I) useful as delta and mu opioid receptor modulators. Pharmaceutical and veterinary compositions and methods of treating mild to severe pain and various diseases using compounds of the invention are also described.