Synthesis 2017; 49(09): 1972-1982
DOI: 10.1055/s-0036-1588695
paper
© Georg Thieme Verlag Stuttgart · New York

N,O-Nucleosides from Ene Reaction of (Nitrosocarbonyl)mesitylene with Crotyl Alcohol: Selectivity, Scope, and Limitations

Autoren

  • Serena Carosso

    a   Department of Chemistry, University of Pavia, Viale Taramelli 12, 27100 Pavia, Italy   eMail: paolo.quadrelli@unipv.it
  • Misal Giuseppe Memeo

    a   Department of Chemistry, University of Pavia, Viale Taramelli 12, 27100 Pavia, Italy   eMail: paolo.quadrelli@unipv.it
  • Bruna Bovio

    a   Department of Chemistry, University of Pavia, Viale Taramelli 12, 27100 Pavia, Italy   eMail: paolo.quadrelli@unipv.it
  • Elena Valletta

    b   Department of System Medicine, University of Rome Tor Vergata, Via Montpellier 1, 00133 Roma, Italy
  • Beatrice Macchi

    a   Department of Chemistry, University of Pavia, Viale Taramelli 12, 27100 Pavia, Italy   eMail: paolo.quadrelli@unipv.it
  • Paolo Quadrelli*

    a   Department of Chemistry, University of Pavia, Viale Taramelli 12, 27100 Pavia, Italy   eMail: paolo.quadrelli@unipv.it
Weitere Informationen

Publikationsverlauf

Received: 09. Dezember 2016

Accepted after revision: 09. Januar 2017

Publikationsdatum:
01. Februar 2017 (online)


Graphical Abstract

Abstract

The (nitrosocarbonyl)mesitylene intermediate undergoes an ene reaction with crotyl alcohol, affording two regioisomeric adducts in fair yields. The sterically demanding (nitrosocarbonyl)mesitylene slightly shifts the C2/Markovnikov orientation towards a C3/anti-Markovnikov­ pathway, affording a 5-hydroxyisoxazolidine that serves as a synthon for the preparation of N,O-nucleoside analogues through the Vorbrüggen protocol. The selectivity of the ene reaction is discussed in the light of C=C bond polarization and steric effects. The structures of the N,O-nucleosides are assigned and discussed on the basis of spectroscopic observations and X-ray analysis.

Supporting Information