4-(N,N-dimethlyamino)pyridine; N-ethyl-N,N-diisopropylamine; dicyclohexyl-carbodiimide in dichloromethane 1.) from -30 to -20 deg C, 2 h, 2.) RT, 16 h;

1: With triethylamine T=0°C; 2: With O-(benzotriazol-1-yl)-N,N,N',N'-tetramethyluronium tetrafluoroborate; triethylamine

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