(1aS,7bR)-3-Bromo-4-[(S)-1-(tert-butyl-dimethyl-silanyloxy)-ethyl]-1a,2,3,7b-tetrahydro-1-oxa-7-aza-cyclopropa[a]naphthalene-6-carboxylic acid methyl ester

(1aS,3R,7bR)-3-Bromo-4-[(S)-1-(tert-butyl-dimethyl-silanyloxy)-ethyl]-1a,2,3,7b-tetrahydro-1-oxa-7-aza-cyclopropa[a]naphthalene-6-carboxylic acid methyl ester

4-[(S)-1-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-5,6-dihydro-quinoline-2-carboxylic acid methyl ester

4-[(S)-1-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-8-hydroxy-5,6,7,8-tetrahydro-quinoline-2-carboxylic acid methyl ester

(1aS,7bR)-4-[(S)-1-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-1a,2,3,7b-tetrahydro-1-oxa-7-aza-cyclopropa[a]naphthalene-6-carboxylic acid methyl ester