DIASTEREOSELECTIVE ADDITION OF METAL-COORDINATED AND NAKED TRI-SEC-BUTYLBOROHYDRIDES TO A NOREPHEDRINE-DERIVED 2-ACETYLOXAZOLIDINE

The addition of tri-sec-butylborohydrides to the 2-acetyl-1,3-oxazolidine 1 can be directed with high selectivity to either the Si or the Re pi-carbonyl face under chelating or non-coordinating conditions, respectively.