[I:1][C:2]1[CH:3]=[C:4]([CH:8]=[CH:9][C:10]=1[CH3:11])[C:5]([OH:7])=O.ClCCl.Cl.CN(C)CCCN=C=NCC.[CH:27]1([CH2:32][CH2:33][NH2:34])[CH2:31][CH2:30][CH2:29][CH2:28]1>CN(C=O)C>[CH:27]1([CH2:32][CH2:33][NH:34][C:5](=[O:7])[C:4]2[CH:8]=[CH:9][C:10]([CH3:11])=[C:2]([I:1])[CH:3]=2)[CH2:31][CH2:30][CH2:29][CH2:28]1In a round-bottomed flask was charged 3-iodo-4-methylbenzoic acid (1.4 g, 5.4 mmol), dicloromethane (4 ml), and DMF (2 ml). This mixture was cooled to 0° C. and 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (1.2 g, 6.3 mmol) was added. The reaction mixture was stirred for 10 min before 2-cyclopentylethanamine (0.47 g, 4.2 mmol) was introduced. The reaction mixture was stirred at 0° C. for 1 h, then at RT under N2 for 16 h. The reaction was partitioned between DCM (60 ml) and brine (50 mL). The aqueous layer was back exacted with DCM (4×20 mL) and the combined DCM layer was dried (Na2SO4) and concentrated. The crude product was dissolved in DCM and purified by chromatography through a Redi-sep pre-packed silica gel column (330 g), eluting with a gradient of 5% to 15% EtOAc in hexane, to provide N-(2-cyclopentylethyl)-3-iodo-4-methylbenzamide as a white solid. MS (ESI, pos. ion) m/z: 358.1 (M+1).
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