Glycosylsulfenyl- und (Glycosylthio)sulfenyl-halogenide (Halogeno- bzw. Halogenothio-(1-thioglycoside)): Herstellung und Umsetzung mit Alkenen
作者:Marianne Hürzeler、Bruno Bernet、Andrea Vasella
DOI:10.1002/hlca.19920750215
日期:1992.3.18
Glycosylsulfenyl snf (Glycosylthio) sulfenyl Halides (Halogeno and Halogenothio 1-Thioglycosides, Resp.): Preparation and Reaction with Alkenes
糖基硫基snf(糖基硫基)亚硫基卤化物(卤代和卤代硫代1-硫代糖苷,分别):制备及与烯烃的反应
New Strategic Reactions for Organic Synthesis: Catalytic Asymmetric C−H Activation α to Oxygen as a Surrogate to the Aldol Reaction
作者:Huw M. L. Davies、Rohan E. J. Beckwith、Evan G. Antoulinakis、Qihui Jin
DOI:10.1021/jo034533c
日期:2003.8.1
The C-H activation of silyl ethers by means of rhodium carbenoid-induced C-H insertion represents a very direct method for the stereoselective synthesis of silyl-protected beta-hydroxy esters. The reaction can proceed with very high regio-, diastereo-, and enantioselectivity and represents a surrogate to the aldol reaction. The reaction is catalyzed by the rhodium prolinate complex Rh(2)(S-DOSP)(4)
Nickel and palladiumcomplexes with the 1,1′-bis(diphenylphosphino)ferrocene ligand effectively catalyze regioselective cross-coupling of allylic ethers such as 1- or 3-methyl-2-propenyl silyl ethers with aryl-Grignard reagents, where the nickel catalyst leads to carbon—carbonbondformation at the more substituted position while carbon–carbon bondformation occurs at the less substituted position
In the presence of catalytic to stoichiometric amounts of trimethylsilyl triflate, 1:1:1 mixtures of silyl ethers, phenyl(trimethylsilyl)sulfide, and aldehydes give O,S-acetals in fair to good yields.
interception of vinyl carbocations with allylethers. The reaction utilizes commercially available borate salts as catalysts and is effective at constructing sterically hindered C–C bonds. The reaction mechanism is studied experimentally and computationally to support a charge-accelerated [3,3] rearrangement of a silyloxonium cation. Our reaction is also applied to the highlystereoselectivesynthesis of fully