in diethyl ether; hexane add. of tert-BuLi in hexane to the hexane and ether sol. of tert-butyltrimethylsilylamine at 0°C with stirring, stirring at room temp. for 1h, addn. of tert-butyldichlorborane in hexane cooled to -78°C, stirring at room temp. for 2d; filtration, removal of the solvent in vac., elem.anal.;

View Scheme

View Scheme

2: hexane View Scheme

2: azidotrimethylsilane View Scheme