Zinc(II) Triflate-Controlled 1,3-Dipolar Cycloadditions of <i>C</i>-(2-Thiazolyl)nitrones: Application to the Synthesis of a Novel Isoxazolidinyl Analogue of Tiazofurin
作者:Ugo Chiacchio、Antonio Rescifina、Maria G. Saita、Daniela Iannazzo、Giovanni Romeo、Juan A. Mates、Tomas Tejero、Pedro Merino
DOI:10.1021/jo051572a
日期:2005.10.1
The cycloaddition reaction between C-(2-thiazolyl) nitrones and allylic alcohol takes place with complete exo selectivity when the reactions are carried out in the presence of 1 equiv of zinc triflate. The rate of the reaction is increased enormously under microwave irradiation. The use of a chiral dipolarophile allowed application of the methodology to the synthesis of a hitherto unknown enantiomerically