A Stereoselective Approach to Optically Active Bifunctional 1,3-Dimethyl-1,3-diphenyldisiloxanes
摘要:
[GRAPHICS]Functionalized disiloxanes have attracted much attention as Versatile synthetic intermediates in the preparation of disiloxane containing polymers. In this report, a highly stereoselective (98% inversion) halogenating cleavage reaction of the silicon-naphthyl bond to obtain optically active (S,S)-1,3-dimethyl-1,3-diphenyldisiloxanediol ((S,S):(R,S):(R,R) = 86:14:0) was demonstrated.
We report the stereochemistry of reactions of various nucleophiles with opticallyactive silyl esters of phosphorus of general formula: tBuPhP(X)OSiMePhNp (X = −(1), Oxygen (2), Sulfur (3), Selenium (4). The list of nucleophiles includes O,S,N,C nucleophiles as well as halides. The nucleophilic attack is essentially directed towards silicon. The phosphinous and phosphonic acid esters react with predominant