1: 76 percent / pyridine, N,N-dimethyl-4-aminopyridine (DMAP) / CH2Cl2 / 4 h / Ambient temperature 2: 38 percent / 35 h / 0.1 M phosphate buffer (pH 7.0), Pseudomonas sp. (SAM II) lipase 3: 1.) trimethyloxonium tetrafluoroborate, 2.) aq. NaOH / 1.) CH2Cl2, RT, 2 h, 2.) CH2Cl2, 2.5 h View Scheme