Fused Heteroaromatic Dihydrosiloles: Synthesis and Double-Fold Modification
摘要:
An efficient method for the synthesis of fused heteroaromatic dihydrosiloles via Ni-catalyzed hydrosilylation/intramolecular Ir-catalyzed dehydrogenative coupling of the Si-H bond with the heteroaromatic C-H bond has been developed. The method is efficient for both electron-deficient and -rich heterocycles. It exhibits high functional group tolerance and good regioselectivity. Fused heteroaromatic dihydrosiloles can be smoothly halogenated and then oxidized or arylated. Application of these transformations allows obtaining highly functionallzed heteroaromatic structures. A gram-scale synthesis of dihydropyridinosilole has also been accomplished using reduced amounts of Ni- and Ir-catalysts.
Substituted diaryl or diheteroaryl methans, ethers and amines having retinoid agonist, antagonist or inverse agonist type biological activity
申请人:——
公开号:US20030109687A1
公开(公告)日:2003-06-12
Compounds of the formula
Y
3
(R
4
)—X—Y
1
(R
1
R
2
)-Z-Y
2
(R
2
)-A-B
where the symbols have the meaning defined in the specification, have retinoid, retinoid antagonist or retinoid inverse agonist type biological activity.