1: 6exo,7exo-epoxy-tropane-3endo-ol; scopine; hydrochloride With sodium hydride in N,N-dimethyl-formamide T=5 - 10°C; 2: 2-hydroxy-2,2-di(thiophen-2'-yl)acetic acid methyl ester With 1,8-diazabicyclo[5.4.0]undec-7-ene in N,N-dimethyl-formamide T=60°C; 5 h; Product distribution / selectivity;