Iridium-catalyzed ring-opening reactions of unsymmetrical oxabenzonorbornadienes with water and alcohol nucleophiles
作者:Jarvis Hill、Christopher Wicks、Austin Pounder、William Tam
DOI:10.1016/j.tetlet.2019.150990
日期:2019.8
The iridium-catalyzed ring-opening reaction of unsymmetrical oxabenzonorbornadienes (OBD) with water and alcohol nucleophiles is reported, with the effects of various C1-substituents explored. Electron-donating alkyl groups lead entirely to the substituted naphthol derivatives in excellent yields while substitution of the C1 position for electron-withdrawing groups afforded ring-opened products in
Rhodium-Catalyzed Asymmetric Cyclodimerization of Oxabenzonorbornadienes and Azabenzonorbornadienes: Scope and Limitations
作者:Anna Allen、Paul Le Marquand、Ryan Burton、Karine Villeneuve、William Tam
DOI:10.1021/jo7012884
日期:2007.10.1
Cationic rhodium(I)-catalyzed cyclodimerization of oxabenzonorbornadienes produced naphtho[1,2-b]furan ring systems in a single step with excellent yields and excellent enantioselectivities. The effect of various Rh(I) catalysts, Ag(I) salts, solvents, and phosphine ligands on the yield and enantioselectivity of the reaction was investigated, and the scope and limitations of this reaction with various
阳离子铑(I)催化的氧杂苯并降冰片二烯环二聚反应可一步合成萘[1,2- b ]呋喃环系统,并具有优异的收率和出色的对映选择性。研究了各种Rh(I)催化剂,Ag(I)盐,溶剂和膦配体对反应收率和对映选择性的影响,并研究了该反应与各种恶双环烯的范围和局限性。用氮杂苯并降冰片二烯类似物获得了相似的结果,以优异的产率和优异的对映选择性提供了相应的环二聚产物。
Regioselective arene homologation through rhenium-catalyzed deoxygenative aromatization of 7-oxabicyclo[2.2.1]hepta-2,5-dienes
作者:Masahito Murai、Takuya Ogita、Kazuhiko Takai
DOI:10.1039/c9cc00270g
日期:——
Combined use of oxorhenium catalysts with triphenyl phosphite as an oxygen acceptor allowed efficient deoxygenative aromatization of oxabicyclic dienes. The reaction proceeded under neutral conditions and was compatible with various functional groups. Combining this deoxygenation with regioselective bromination and trapping of the generated aryne with furan resulted in benzannulative π-extension at
Ruthenium(II)-Catalyzed Cyclization of Oxabenzonorbornenes with Propargylic Alcohols: Formation of Isochromenes
作者:Karine Villeneuve、William Tam
DOI:10.1002/ejoc.200600836
日期:2006.12
The ruthenium-catalyzed cyclization of a propargylicalcohol with an oxabenzonorbornene in methanol leads to an unanticipated isochromene framework. The catalytic cycle to form this product is believed to go through an oxidative cyclization of the two unsaturated partners with the ruthenium catalyst, followed by β-hydride elimination, tautomerization andhydroruthenation. The ruthenacyclobutane thus