Hydrogen bond donor-acceptor-donor organocatalysis for conjugate addition of benzylidene barbiturates via complementary DAD-ADA hydrogen bonding

Franco King Chi Leung, Jian Fang Cui, Tsz Wai Hui, Zhong Yuan Zhou, Man Kin Wong

Research output: Journal article publicationJournal articleAcademic researchpeer-review

3 Citations (Scopus)


A new class of hydrogen bond donor-acceptor-donor (HB-DAD) organocatalysts has been developed for conjugate addition of benzylidene barbiturates. HB-DAD organocatalyst 1a (featuring para-chloro-pyrimidine as the hydrogen bond acceptor (HBA), N-H as the hydrogen bond donor (HBD) and a trifluoroacetyl group as the electron withdrawing group (EWG)) is able to activate benzylidene barbiturates through complementary DAD-ADA hydrogen bonding. Using 1a in benzylidene barbiturate conjugate addition, good yields were achieved. The relative rate constant (krel= 2.9) of 1a in catalyzing the conjugate addition of benzylidene barbiturates and the binding constant (KA= 8936 (±723) M-1) of 1a with benzylidene barbiturates were determined by NMR and UV/Vis. spectroscopy studies. The excellent correlation (R2= 0.97) between the relative rate constant and binding affinity of 1a with benzylidene barbiturates provides support for the importance of DAD-ADA hydrogen bonding in organocatalysis. This journal is
Original languageEnglish
Pages (from-to)26748-26756
Number of pages9
JournalRSC Advances
Issue number51
Publication statusPublished - 1 Jan 2014

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

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