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Reagents and conditions: a) SOCl2, toluene, DMF, RT, 12 h. (b) (1-methylpyrrolidin-3-yl)methanamine for 17a, (1-ethylpyrrolidin-3-yl)methanamine for 17b, (1-propylpyrrolidin-3-yl)methanamine for 17c, CHCl3, TEA, 0 °C to RT, 48 h. (c) CDI/THF, RT, overnight.
