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

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

4-Acetyl-5,6-dihydro-quinoline-2-carboxylic acid methyl ester

(1aS,7bR)-4-Acetyl-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-hydroxy-ethyl)-1a,2,3,7b-tetrahydro-1-oxa-7-aza-cyclopropa[a]naphthalene-6-carboxylic acid methyl ester