Chem. J. Chinese Universities ›› 2023, Vol. 44 ›› Issue (2): 20220473.doi: 10.7503/cjcu20220473

• Organic Chemistry • Previous Articles     Next Articles

Palladium Catalyzed Selective Synthesis of Pyrrolofuran Derivatives and Carbamates from Propargylic Alcohols and tert⁃Butyl Isonitrile

LIN Junxu1, XI Zhiwei2, LI Zhiping1, WANG Yingchun1()   

  1. 1.College of Chemistry and Chemical Engineering,Hunan Engineering Laboratory for Analyse and Drugs Development of Ethnomedicine in Wuling Mountains,Jishou University,Jishou 416000,China
    2.Power China Zhongnan Engineering Corporation Limited,Changsha 410014,China
  • Received:2022-07-11 Online:2023-02-10 Published:2022-10-21
  • Contact: WANG Yingchun E-mail:wangyingchunjsu@163.com
  • Supported by:
    the Natural Science Foundation of Hunan Province, China(2020jj4499);the Natural Science Foundation of Hunan Provincial Department of Education, China(20A413);the Graduate Research Innovation Project of Hunan Province, China(CX20211036)

Abstract:

Palladium catalyzed highly selective synthesis of pyrrolofuran derivatives and carbamates from propargylic alcohols and tert-butyl isonitrile was described. In the presence of 10%(molar fraction) Pd(OAc)2 and 110% (molar fraction) LiBr, an “orderly” isonitrile triple insertion reaction occurred between one molecule of propargylic alcohols and three molecules of tert-butyl isonitrile with the participation of water, and pyrrolofuran derivatives were selectively obtained in 56%—73% yields. Whereas in the presence of 10%(molar fraction) Pd(PPh34 and 110%(molar fraction) K3PO4, carbamates were exclusively produced in 51%—74% yields via oxidative coupling reaction between a molecule of propargylic alcohols and a molecule of tert-butyl isonitrile with the participation of air(O2). Different products with high selectivity could be obtained by simply changing different kinds of palladium catalyst and salt, and this method provides an attractive synthesis route toward pyrrolofuran derivatives and carbamates, respectively.

Key words: Pd catalysis, Propargylic alcohol, tert-Butyl isonitrile, Selective synthesis

CLC Number: 

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