The synthesis and characterization of a series of tricarbastannatranes, in the solid state and in solution, are described. The structures of the complexes [N(CH2 CH2 CH2 )3 Sn](BF4 ), [N(CH2 CH2 CH2 )3 Sn](SbF6 ), [N(CH2 CH2 CH2 )3 Sn]4 [(SbF6 )3 Cl], and [(N(CH2 CH2 CH2 )3 Sn)2 OH][MeB(C6 F5 )3 ] were determined by X-ray crystallography. Furthermore, the B(C6 F5 )3 -promoted conjugate addition of alkyl-tricarbastannatranes to benzylidene derivatives of Meldrum's acid was investigated, and detailed mechanistic studies are presented.
The synthesis and characterization of as eries of tricarbastannatranes,i nt he solid state and in solution, are described.The structures of the complexes [N(CH 2
An efficient three-component synthesis of 3-(1,3,4-oxadiazol-2-yl)-3-hydroxy-1,3-dihydro-2H-indol-2-ones is described. A mixture of N-isocyaniminotriphenylphosphorane, an isatin, and a carboxylic acid undergoes a 1:1:1 addition reaction under mild conditions to afford the title compounds in excellent yields.
Tris(pentafluorophenyl)borane, B(CF), has been found to be an effective catalyst to access the hydridoborate anion, [N(CHCHCH)Sn][HB(CF)], via hydride abstraction from the hypercoordinated tin reagent, iPr-tricarbastannatrane. This process has been applied to the B(CF)-catalyzed transfer 1,4-hydrostannylation of electron-deficient olefins, namely benzylidene barbituric acids. Insights into the mechanism have been obtained via a series of H,H, B,C, and Sn NMR spectroscopy, mass spectrometry, and labeling experiments.
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