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Syntheses of 15a–b and 17a–g. Reagents and conditions: (a) Oxalyl chloride, DMSO, CH2Cl2, triethylamine, −78 °C–RT; (b) NaBH3CN amines, acetic acid, methanol, RT; (c) cyanuric chloride, DMF, CH2Cl2, RT; (d) NaH, alcohols, THF, reflux; (e) 4.0 M HCl in dioxane, RT.
