C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.[I:20]I.N1C=CN=C1.[C:27]([O:31][C:32]([N:34]1[CH2:37][CH:36]([CH:38]([C:40]2[CH:45]=[CH:44][C:43]([Cl:46])=[CH:42][CH:41]=2)O)[CH2:35]1)=[O:33])([CH3:30])([CH3:29])[CH3:28]>O1CCCC1.C(#N)C.O1CCCC1>[C:27]([O:31][C:32]([N:34]1[CH2:37][CH:36]([CH:38]([C:40]2[CH:45]=[CH:44][C:43]([Cl:46])=[CH:42][CH:41]=2)[I:20])[CH2:35]1)=[O:33])([CH3:30])([CH3:29])[CH3:28]Polymer supported triphenylphosphine (125 g, 370 mmol) is suspended in tetrahydrofuran: acetonitrile 9:1 (1000 ml) and treated with Iodine (95.2 g, 370 mmol) followed by stirring for 15 minutes. Imidazole (25.5 g, 370 mmol) is added followed by a solution of 3-[(4-Chloro-phenyl)-hydroxy-methyl]-azetidine-1-carboxylic acid tert-butyl ester (44.7 g, 150 mmol) in tetrahydrofuran (150 ml) and the reaction mixture stirred at ambient temperature for 20 hours. The reaction mixture is filtered through celite™ filter material and the filtrate evaporated. The residue is taken up in chloroform and washed with sodium thiosulphate solution, water and brine. The solution is dried over magnesium sulphate and evaporated to provide 3-[(4-Chlorophenyl)-iodo-methyl]-azetidine-1-carboxylic acid tert-butyl ester. 1H NMR 400 MHz, CDCl3, δ 1.35 (9H), 3.21 (1H), 3.37 (1H), 3.60 (2H), 4.05 (1H), 5.12 (1H), 7.20 (4H).
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