[EN] FLAVONE COMPOUNDS FOR THE TREATMENT AND PROPHYLAXIS OF HEPATITIS B VIRUS DISEASE [FR] COMPOSÉS DE FLAVONE POUR LE TRAITEMENT ET LA PRÉVENTION D'UNE MALADIE CAUSÉE PAR LE VIRUS DE L'HÉPATITE B
Cobalt (II) Chloride Catalysed Regioselective Cleavage of Oxiranes with Chlorotrimethylsilane
作者:Javed Iqbal、Mohd. Amin Khan
DOI:10.1246/cl.1988.1157
日期:1988.7.5
Oxiranes can be cleaved regioselectively with chlorotrimethysilane in presence of cobalt(II) chloride to the corresponding O-silylated vicinal chlorohydrins in excellent yields.
Highly regioselective and stereospecific functionalization of 1,2-propanediol with trimethyl(X)silanes employing the 1,3,2.lambda.5-dioxaphospholane methodology
作者:Isabel Mathieu-Pelta、Slayton A. Evans
DOI:10.1021/jo00038a032
日期:1992.6
The regioselective ring opening of (S)-4-methyl-2,2,2-triphenyl-1,3,2-lambda-5-dioxaphospholane (2) [prepared from the bis(transoxyphosphoranylation) of (S)-1,2-propanediol (1) with diethoxytriphenylphosphorane (DTPP)] was initiated with several trimethylsilyl reagents (Me3SiX: X = PhS, I, Br, Cl, CN, and N3) to afford the regioisomeric (silyloxy)phosphonium salts. A stereospecific extrusion of triphenylphosphine oxide from these oxyphosphonium salts gave predominantly the thermodynamically less stable C-2-X-substituted derivatives with nearly complete inversion of stereochemistry at the C-2 stereogenic center (i.e., X = PhS).
Malinowskii; Romanzewitsch, Zhurnal Obshchei Khimii, 1959, vol. 29, p. 888;engl.Ausg.S.871