ethyl 3,4-O-isopentylidene-5-oxo shikimate

(3aR,7aS)-ethyl 2,2-diethyl-7-(hydroxyimino)-3a,6,7,7a-tetrahydrobenzo[d][1,3]dioxole-5-carboxylate

ethyl 3,4-O-isopentylidene-5α-amino shikimate

ethyl (3R,4S,5S)-3-(1-ethylpropoxy)-4-hydroxy-5-amino-cyclohex-1-ene-1-carboxylate

ethyl 3-((3aS,4R,6S,6aS)-6-(benzyloxy)-2,2-diethyltetrahydrofuro[3,4-d][1,3]dioxol-4-yl)-2-(diethoxyphosphoryl)acrylate