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Synthesis of iodo diene 18.
a) (COCl)2, DMSO, Et3N, CH2Cl2 0°C, 3 h; b) (carboethoxyethylidene)triphenylphosphorane, reflux, 12 h, 85%, 20:1 E:Z; c) DIBAl-H, CH2Cl2,rt, 2 h, 55%; d) MnO2, THF, 24h e) CrCl2, CHI3, dioxane:THF 6:1, 2 h, 0°C, 65% 2 steps, 10:1 E:Z.
