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Reagents: (a) 4.0 M HCl in dioxane (100%); (b) CH2Cl2 or THF, Et3N/DMF, DIEA, t-butylisocyanate (23, 55%), acetyl chloride (24, 34%), 4-morpholinecarbonylchloride (25, 17%), nicotinoylchloride × HCl (26, 39%), or cyclopentyl chloro-formate (27, 48%; 28, 56%; 29, 51%).
