(Z,2S,3R,8R,9S)-8-tert-butyldiphenylsilanyloxy-2-cyanomethyl-9-ethyl-3-(4-methoxybenzyloxy)-2,3,4,7,8,9-hexahydrooxonine

(Z,2S,3R,8R,9S)-3-tert-butyldiphenylsilanyloxy-2-ethyl-9-((Z)-3-iodoprop-3-enyl)-8-(4-methoxybenzyloxy)-2,3,4,7,8,9-hexahydrooxonine

(Z,2S,3R,8S,9S)-8-bromo-9-ethyl-3-hydroxy-2-((Z)-pent-2-en-4-ynyl)-2,3,4,7,8,9-hexahydrooxonine