Formamides undergo in-plane bimolecular nucleophilic vinylic substitutions (SN2) by the reaction with (E)-alkenyl(phenyl)iodonium tetrafluoroborates: stereoselective synthesis of (Z)-vinyl formates

(Note: The full text of this document is currently only available in the PDF Version )

Masahito Ochiai, Shinji Yamamoto and Koichi Sato


Abstract

Reported for the first time is the stereoselective synthesis of (Z)-vinyl formates, which involves in-plane bimolecular nucleophilic vinylic substitutions of (E)-β-alkylvinyl(phenyl)iodonium tetrafluoroborates with formamides.


References

  1. F. Nakatsubo, Y. Kishi and T. Goto, Tetrahedron Lett., 1970, 381 CrossRef CAS; L. Syper, Tetrahedron, 1987, 43, 2853 CrossRef CAS.
  2. P. Magnus and G. Roy, J. Chem. Soc., Chem. Commun., 1978, 297 RSC.
  3. For reviews of organoiodanes see: G. F. Koser inThe Chemistry of Functional Groups, Supplement D, Wiley, New York, 1983, ch. 18 Search PubMed; M. Ochiai and Y. Nagao, J. Synth. Org. Chem. Jpn., 1986, 44, 660 Search PubMed; R. Moriarty and O. Prakash, Acc. Chem. Res., 1986, 19, 244 Search PubMed; M. Ochiai, Rev. Heteroatom Chem., 1989, 2, 92 CrossRef CAS; Y. Kita, H. Tohma and T. Yakura, Trends Org. Chem., 1992, 3, 113 Search PubMed; A. Varvoglis, The Chemistry of Polycoordinated Iodine, VHC, New York, 1992 Search PubMed; G. F. Koser, in The Chemistry of Functional Groups, Supplement D2, Wiley, New York, 1995, ch. 21  Search PubMed; T. Kitamura, J. Synth. Org. Chem. Jpn., 1995, 53, 893 Search PubMed; P. J. Stang and V. V. Zhdankin, Chem. Rev., 1996, 96, 1123 Search PubMed.
  4. For reviews of nucleophilic vinylic substitutions, see: Z. Rappoport, Acc. Chem. Res., 1981, 14, 7 Search PubMed; Z. Rappoport, Recl. Trav. Chim. Pays-Bas, 1985, 104, 309 CrossRef CAS.
  5. For theoretical studies, see: D. R. Kelsey and R. G. Bergman, J. Am. Chem. Soc., 1971, 93, 1953 Search PubMed; M. N. Glukhovtsev, A. Pross and L. Radom, J. Am. Chem. Soc., 1994, 116, 5961 CrossRef; V. Lucchini, G. Modena and L. Pasquato, J. Am. Chem. Soc., 1995, 117, 2297 CrossRef CAS.
  6. M. Ochiai, K. Oshima and Y. Masaki, J. Am. Chem. Soc., 1991, 113, 7059 CrossRef CAS; T. Okuyama, T. Takino, K. Sato and M. Ochiai, J. Am. Chem. Soc., 1998, 120, 2275 CrossRef; T. Okuyama T. Takino, K. Sato, K. Oshima, S. Imamura, H. Yamataka, T. Asano and M. Ochiai, Bull. Chem. Soc. Jpn., 1998, 71, 243 CAS.
  7. For leaving group ability of the aryliodonio groups, see: M. Ochiai in Chemistry of Hypervalent Compounds, ed. K. Akiba, Wiley-VCH, New York, 1999, ch. 12  Search PubMed; T. Okuyama, T. Takino, T. Sueda and M. Ochiai, J. Am. Chem. Soc., 1995, 117, 3360 Search PubMed.
  8. T. Okuyama and M. Ochiai, J. Am. Chem. Soc., 1997, 119, 4785 CrossRef CAS; T. Okuyama, H. Oka and M. Ochiai, Bull. Chem. Soc. Jpn., 1998, 71, 1915 CAS.
  9. B. C. Challis and J. A. Challis, The Chemistry of Amides, ed. J. Zabicky, Interscience, New York, 1970, ch. 13 Search PubMed.
  10. Formation of dec-1-yne 4a from the vinyliodonium salt 1a by the reaction with Et3N has been firmly established to involve α-elimination–rearrangement pathways (ref. 11).
  11. M. Ochiai, Y. Takaoka and Y. Nagao, J. Am. Chem. Soc., 1988, 110, 6565 CrossRef CAS; M. Ochiai, M. Kunishima, S. Tani and Y. Nagao, J. Am. Chem. Soc., 1991, 113, 3135 CrossRef CAS; M. Ochiai, K. Uemura and Y. Masaki, J. Am. Chem. Soc., 1993, 115, 2528 CrossRef CAS; M. Ochiai, T. Sueda, K. Uemura and Y. Masaki, J. Org. Chem., 1995, 60, 2624 CrossRef CAS.
Click here to see how this site uses Cookies. View our privacy policy here.