Palladium-Catalyzed Carbonylative Cyclization of Unsaturated Aryl Iodides and Dienyl Triflates, Iodides, and Bromides to Indanones and 2-Cyclopentenones
作者:Steve V. Gagnier、Richard C. Larock
DOI:10.1021/ja0212009
日期:2003.4.1
carbonylative cyclization is particularly effective on substrates that contain a terminal olefin. The proposed mechanism for this annulation includes (1) Pd(OAc)(2) reduction to the active palladium(0) catalyst, (2) oxidative addition of the organichalide or triflate to Pd(0), (3) coordination and insertion of carbon monoxide to produce an acylpalladium intermediate, (4) acylpalladation of the neighboring
half esters, resulting from the Stobbe condensation of α-tetralone with succinic esters, on cyclization give the keto-ester “ethyl 3-ketoΔ8-6,7-benzhydrindan-1-carboxylate”. This on Clemmensen reduction yields the corresponding αβ-unsaturated ester, from which 6,7-benzhydrindan-1-carboxylic acid was prepared by catalytic reduction and hydrolysis and this acid 6,7-benzhydrindan-1-hydroxymethyl ketone
Facile and Efficient Synthesis of Lactols by a Domino Reaction of 2,3-Epoxy Alcohols with a Hypervalent Iodine(III) Reagent and Its Application to the Synthesis of Lactones and the Asymmetric Synthesis of (+)-Tanikolide
作者:Hiromichi Fujioka、Satoshi Matsuda、Mai Horai、Eri Fujii、Maiko Morishita、Natsuko Nishiguchi、Kayoko Hata、Yasuyuki Kita
DOI:10.1002/chem.200601341
日期:2007.6.15
The dominoreaction of 2,3-epoxy-1-alcohol derivatives, namely tetrasubstituted 2,3-epoxy-1-alcohols and 2- or 3-alkyl trisubstituted 2,3-epoxy-1-alcohols, with PhI(OCOCF(3))(2) in the presence of H(2)O is described in detail. In this reaction, several types of lactol derivatives can be directly obtained from the 2,3-epoxy-1-alcohol derivatives in a single operation. The obtained lactols were successively
Palladium-catalyzed intramolecular 5-endo–trig oxidative Heck cyclization: a facile pathway for the synthesis of some sesquiterpene precursors
作者:Devalina Ray、Sunanda Paul、Sulagna Brahma、Jayanta. K. Ray
DOI:10.1016/j.tetlet.2007.09.052
日期:2007.11
An efficient and convenient method for the construction of substituted cyclopentenones via palladium-catalyzed intramolecular 5-endo–trig oxidative cyclization has been introduced as a powerful new strategy for the synthesis of sesquiterpenes.
Catalytic incorporation of carbon monoxide into a ketonic carbon. Conversion of cyclobutanones to disiloxycyclopentenes with hydrosilane and carbon monoxide in the presence of cobalt carbonyl