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Reaction conditions are as follows: c) pyridine, acetyl chloride added drop-wise at 0°C, stirred overnight at RT d) 0.9 eq. SOCl2, 12 hr. stirred under argon at 40°C, catalytic DMF; e) DCM, triethylamine added drop-wise at 0°C, stirred 24 hr. under argon at RT.
