First and unexpected synthesis of macrocyclic cyclophane-based unusual α-amino acid derivatives by phosphazene base without high dilution conditions
摘要:
First synthesis of a macrocylic cyclophane-based unusual a-amino acid derivative 11 by coupling of ethyl iso-cyanoacetate with 1,2-bis(4-bromomethylphenyl)ethane under phase-transfer catalysis (PTC) conditions. Phosphazene base such as 2-tert-butylimino-2-diethylamino-1,3-dimethylperhydro-1,3,2-diazaphosphorine (BEMP) is useful to improve the yield of cyclophane derivative without high dilution conditions. (C) 2002 Elsevier Science Ltd. All rights reserved.
First and unexpected synthesis of macrocyclic cyclophane-based unusual α-amino acid derivatives by phosphazene base without high dilution conditions
摘要:
First synthesis of a macrocylic cyclophane-based unusual a-amino acid derivative 11 by coupling of ethyl iso-cyanoacetate with 1,2-bis(4-bromomethylphenyl)ethane under phase-transfer catalysis (PTC) conditions. Phosphazene base such as 2-tert-butylimino-2-diethylamino-1,3-dimethylperhydro-1,3,2-diazaphosphorine (BEMP) is useful to improve the yield of cyclophane derivative without high dilution conditions. (C) 2002 Elsevier Science Ltd. All rights reserved.