Recent Developments in the Chemistry of Heteroaromatic N-Oxides
作者:Liming Zhang、Youliang Wang
DOI:10.1055/s-0034-1379884
日期:——
ortho-Alkyl C–H Functionalization 4.3.3 N-Oxide Directed Remote C–H Functionalization 4.4 1,3-Dipolar Cycloaddition 5 Conclusion and Outlook Selected developments in the chemistry of heteroaromatic N-oxides since 2001 are presented in this review. The use of these N-oxides, both in late-transition-metal-catalyzed oxidations of carbon–carbon triple bonds and in regioselective C–H functionalizations of the heteroarene
Site-Selective sp<sup>2</sup> and Benzylic sp<sup>3</sup> Palladium-Catalyzed Direct Arylation
作者:Louis-Charles Campeau、Derek J. Schipper、Keith Fagnou
DOI:10.1021/ja710451s
日期:2008.3.1
Palladium-catalyzed siteselective arylation reactions of both sp2 and benzylic sp3 sites on azine and diazine N-oxide substrates are described that occur in good to excellent yield and with complete selectivity for reaction at the desired position. These studies have uncovered the need to properly control the metal to ligand ratio in sp2 arylation and necessitated a complete reinvestigation of all reaction parameters
Heterocyclic derivatives in the treatment of ischaemia and related
申请人:Syntex Pharmaceuticals, Limited
公开号:US05545645A1
公开(公告)日:1996-08-13
Compounds of the formula: ##STR1## wherein: m is 0 or 1; R.sup.1 is hydrogen, hydroxy, or lower alkyl; R.sup.2 is hydrogen, or lower alkyl; R.sup.3 is ##STR2## or R.sup.2 and R.sup.3 taken together with the nitrogen atom to which they are attached represent a group of the formula: ##STR3## wherein: n is 0 or 1; p is 0, 1, 2 or 3; q is 0 or 1; R.sup.4 is hydrogen, lower alkyl, cycloalkyl, or optionally substituted phenyl; R.sup.5 is optionally substituted phenyl; X is (CH.sub.2).sub.p, or 4-piperidin-1-yl; Y is CH, CH--O--, CH--S--, or nitrogen; Z is CH.sub.2, NH, sulfur, or oxygen; and A is a substituted furanyl group.
moiety followed by β-C elimination strategy was less studied. Here a palladium-catalyzed C–C bond activation of an unstrained ketone enabled by a removable directing group through β-C elimination to synthesize 2-arylpyridine is described. The protocol features wide substrate scope with yields up to 95%, good functional group tolerance, and functionality of natural products. The 2-arylpyridine N-oxide