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).
Kricheldorf,H.R., Angewandte Chemie, 1979, vol. 91, p. 749
作者:Kricheldorf,H.R.
DOI:——
日期:——
KRICHELDORF H. R.; MOERBER G.; REGEL W., SYNTHESIS, 1981, NO 5, 383-384
作者:KRICHELDORF H. R.、 MOERBER G.、 REGEL W.
DOI:——
日期:——
Reactions d'halogeno-2, -3 et -4 alcoxysilanes avec le magnesium: resultants experimentaux et etude du mecanisme