1: (2S,3R)-2-(benzyloxymethyl)-3-(tributylstannyl)-1-tritylaziridine With n-butyllithium in tetrahydrofuran; hexane T=-60 - -30°C; 0.5 h; Inert atmosphere; 2: 5-chloro-1-aza-5-stannatricyclo{3.3.3.0(1,5)}undecane in tetrahydrofuran; hexane T=-78 - 20°C; 1.16667 h; Inert atmosphere; Overall yield = 96 percent; Overall yield = 0.95 g;

in diethyl ether byproducts: LiCl; dropping LiCH3 in ether to a suspension of the chloride in ether at -78°C under stirring; filtration;; recrystallization from acetone, elem. anal.;;