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Reagents and conditions: (a) phosphorus oxychloride, DMF, toluene, 80 °C, 3 h; (b) 2,5-dihydroxy-1,4-dithiane, Et3N, CH3OH, 50 °C, 2.5 h; (c) oxalyl chloride, 1,2-dichloroethane, reflux, 4 h; (d) ethylamine, CH3CN, −10 °C, 3 h.
