Synthesis 2012; 44(10): 1559-1568
DOI: 10.1055/s-0031-1290976
paper
© Georg Thieme Verlag Stuttgart · New York

N-Heterocyclic Carbene Catalyzed Intramolecular Hydroacylation of Alkynylphosphonates

Authors

  • Zhenqiang Wang

    Key Laboratory of Pesticide and Chemical Biology, Ministry of Education, College of Chemistry, Central China Normal University, Wuhan 430079, P. R. of China, Fax: +86(27)67862041   eMail: chshidq@mail.ccnu.edu.cn
  • Zhihua Yu

    Key Laboratory of Pesticide and Chemical Biology, Ministry of Education, College of Chemistry, Central China Normal University, Wuhan 430079, P. R. of China, Fax: +86(27)67862041   eMail: chshidq@mail.ccnu.edu.cn
  • Ying Wang

    Key Laboratory of Pesticide and Chemical Biology, Ministry of Education, College of Chemistry, Central China Normal University, Wuhan 430079, P. R. of China, Fax: +86(27)67862041   eMail: chshidq@mail.ccnu.edu.cn
  • Deqing Shi*

    Key Laboratory of Pesticide and Chemical Biology, Ministry of Education, College of Chemistry, Central China Normal University, Wuhan 430079, P. R. of China, Fax: +86(27)67862041   eMail: chshidq@mail.ccnu.edu.cn
Weitere Informationen

Publikationsverlauf

Received: 13. Januar 2012

Accepted after revision: 24. März 2012

Publikationsdatum:
02. Mai 2012 (online)


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Abstract

Two exocyclic and endocyclic olefin tautomers of chromone phosphonates were obtained in good to excellent yields at different temperatures by utilizing an N-heterocyclic carbene catalyst in the intramolecular reactions between the formyl group and alkynylphosphonates. The exocyclic olefins can isomerize to the endocyclic derivatives completely when treated with a thiazolium salt precatalyst and potassium carbonate at 30 °C for three to five hours. In addition, the chromone phosphonate derivatives were also applied in the one-pot synthesis of benzopyranopyridine phosphonates in moderated yields.