Regioselectivity studies of sydnone cycloaddition reactions of azine-substituted alkynes
作者:Robert S. Foster、Harald Jakobi、Joseph P.A. Harrity
DOI:10.1016/j.tetlet.2011.01.115
日期:2011.3
The synthesis of azine-substituted pyrazoles by a sydnone cycloaddition strategy is described. Incorporation of a 3-pyridyl moiety at the sydnone N-atom has little effect on either reactivity or regioselectivity, however, 2-ethynyl-pyridine and -pyrimidine undergo cycloaddition with surprisingly poor levels of regiocontrol. A rationale for the observed regiochemical trends and potential routes for improving selectivities are discussed. (C) 2011 Elsevier Ltd. All rights reserved.
Browne, Duncan L.; Vivat, Jerome F.; Plant, Andrew, Journal of the American Chemical Society, 2009, vol. 131, p. 7762 - 7769
作者:Browne, Duncan L.、Vivat, Jerome F.、Plant, Andrew、Gomez-Bengoa, Enrique、Harrity, Joseph P. A.