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Reagents and conditions: (i) DIPEA, MOMCl, 0 °C, 1 h, 79%; (ii) DEA, EtOH, 150 °C, pressure tube, 1 h; (iii) concentrated HCl, MeOH, rt, 24 h; (iv) pyridine, EtOH, rt, 26–72 h.
Without isolating the MOM-protected intermediate.
