1: (3aS,4aS,6S,7S,7aS,7bS)-7-((Z)-6-Chloro-hex-2-enyl)-2,2-dimethyl-6-(toluene-4-sulfonyl)-hexahydro-cyclopenta[4,5]furo[2,3-d][1,3]dioxole With n-butyllithium in tetrahydrofuran; hexane T=-100 - -73°C; 2: 1,1-dibromomethane in tetrahydrofuran; hexane T=-99 - -63°C;

1: (3aS,4aS,6S,7S,7aS,7bS)-7-((Z)-6-Chloro-hex-2-enyl)-2,2-dimethyl-6-(toluene-4-sulfonyl)-hexahydro-cyclopenta[4,5]furo[2,3-d][1,3]dioxole With n-butyllithium in tetrahydrofuran; hexane T=-68 - -48°C; 2: n-butyllithium; 1,1-dibromomethane in tetrahydrofuran; hexane T=-68 - -55°C;

1: (3aS,4aS,6S,7S,7aS,7bS)-7-((Z)-6-Chloro-hex-2-enyl)-2,2-dimethyl-6-(toluene-4-sulfonyl)-hexahydro-cyclopenta[4,5]furo[2,3-d][1,3]dioxole With n-butyllithium in tetrahydrofuran; hexane T=-58 - -49°C; 2: 1-bromo-butane in tetrahydrofuran; hexane T=-64 - -39°C; 1.08333 h;

1: (3aS,4aS,6S,7S,7aS,7bS)-7-((Z)-6-Chloro-hex-2-enyl)-2,2-dimethyl-6-(toluene-4-sulfonyl)-hexahydro-cyclopenta[4,5]furo[2,3-d][1,3]dioxole With n-butyllithium in tetrahydrofuran; hexane T=-95 - -72°C; 2: BuCHBr2 in tetrahydrofuran; hexane T=-97 - -62°C;