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3-Hydroxycholan-24-oic acid esters are easily converted into the corresponding 3-amino derivatives via Mitsunobu reaction with diphenylphosphoryl azide (DPPA) and Staudinger reduction with PPh3/H2O of the intermediate azido compound in THF.
DTPA = diethylenetriaminopentaacetic acid
DOTA = 1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraaceticacid
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