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Novel synthesis of N(4)-substituted 1,4-benzodiazepine-2,5-diones using poly(ethylene glycol) as soluble polymer
Zhen Rao1, Hongdan Peng, Guichun Yang
1Ministry-of-Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules, Hubei University, Faculty of Chemistry and Chemical Engineering, Hubei University, Wuhan, Hubei, PR China.
Abstract:
An efficient method for the liquid-phase combinatorial synthesis of N4-substituted 1,4-benzodiazepine-2,5-diones has been developed. Poly(ethylene glycol) (PEG) stepwise reacted with bromoacetyl bromide, a primary amine and 2-azidobenzoic acid to give a potential PEG-bound dipeptide, which was reduced by NaI / acetic acid, along with concurrent cyclization and cleavage of the seven-membered heterocycle from the PEG support.
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