916179-88-9Relevant articles and documents
A Palladium(II)-Catalyzed C-H Activation Cascade Sequence for Polyheterocycle Formation
Cooper, Stephen P.,Booker-Milburn, Kevin I.
supporting information, p. 6496 - 6500 (2015/06/02)
Polyheterocycles are found in many natural products and are useful moieties in functional materials and drug design. As part of a program towards the synthesis of Stemona alkaloids, a novel palladium(II)-catalyzed C-H activation strategy for the construction of such systems has been developed. Starting from simple 1,3-dienyl-substituted heterocycles, a large range of polycyclic systems containing pyrrole, indole, furan and thiophene moieties can be synthesized in a single step. Don't overdo it: A palladium(II)-catalyzed C-H activation cascade sequence for the synthesis of polyheterocycles is reported. Aromatization of the initially formed dihydro species occurred with a quinone oxidant. In some cases the use of one equivalent of the oxidant enabled isolation of the dihydro species as a single isomer (see scheme; X=NMe, O, S).
OXADIAZOLE DERIVATIVES AND THEIR USE AS NICOTINIC ACETYLCHOLINE RECEPTOR MODULATORS
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Page/Page column 31, (2009/07/17)
Oxadiazole derivatives of formula (I) where ring A is a bicyclic or tricyclic system. Claimed compounds are active on nicotinic acetylcholine receptors (nAChRs), and are useful to treat neurological, psychiatric, and gastrointestinal disorders, as well as sepsis and obesity.