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Four galactofuranose-containing disaccharides have been prepared utilising various thioimidates [Galf-SC(NR)XR′] and suitably protected acceptors as key precursors. We observed that the efficiency of the coupling reactions was particularly dependent on the ...
Task-specific ionic liquids bearing nitrile functional groups attached to the cation and nitrogen-donor-containing anions strongly affect the efficiency of the Stille cross-coupling, influencing the nature of the catalyst and its stability. The relative st ...
Aryl and alkenyl sulfonyl chlorides can be used in Heck-Mizoroki-type couplings with mono- and disubstituted olefins in a nitrile-functionalized ionic liquid, viz. [C3CNpy][Tf2N]. Advantages over previously reported methods include: (1) use of a cheap cat ...
New conditions have been found for the desulfitative Mizoroki-Heck arylation and trifluoromethylation of mono- and disubustituted olefins with arenesulfonyl and trifluoromethanesulfonyl chlorides. Thus (E)1,2-disubstituted alkenes with high stereoselectivi ...
A series of relatively low-cost ionic liquids, based on the N-butyronitrile pyridinium cation C(3)CNpy, designed to improve catalyst retention, have been prepared and evaluated in Suzuki and Stille coupling reactions. Depending on the nature of the an ...
Fluorine, be it as individual atoms or CF3 groups, facilitates and orients the deprotonation of arenes and hetarenes (pyridines etc.). Representative examples will illustrate the concept of "optional site selectivity" in organometallic reactions. Using flu ...
Toluene oxidn. over Pb/Li/MgO is investigated in a tubular fixed bed reactor at low conversions. A periodic process alternating toluene oxidn. in absence of oxygen in the feed and regeneration of the catalyst by oxygen presents important changes in product ...
Palladium-catalyzed Suzuki cross-coupling, Corey's enantioselective alkylation of glycine template, and macrolactamization are key steps in an efficient synthesis of the 15-membered macrocycle I, the A-B biaryl macrocyclic component of RP-66453 (II). Unfor ...
tual control method, recently introduced to approximate elliptic and parabolic problems by overlapping domain decompositions, is proposed here for heterogeneous problems. Precisely, we address the coupling of an advection equation with a diffusion-advectio ...
A novel macrocyclization procedure is developed on the basis of a domino process. Thus, treatment of linear diiodide I under defined conditions gave a 15-membered m,m-cyclophane via aryl-aryl bond formation. Two distinct cross-coupling manifolds, Miyaura's ...
