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Reagents and conditions; (i) 7, TfOH, NIS, anhyd. CH2Cl2, 4 Å MS, −10 °C to rt, 74%; (ii) 2.5 M NaOMe, MeOH, rt, 3 h; (iii) Pd/C, H2, HCl, 1 : 1 CH2Cl2 : MeOH, o/n, 49% over two steps; (iv) (a) C25H51COOH, Et3N, isopropyl chloroformate (1 M in tol), anhyd. CH2Cl2, rt, 2 h; (c) 23, 1 : 0.2 CH2Cl2 : DMF, 0 °C to rt, o/n, 94%.
