InBr3-catalyzed stereoselective synthesis of trans-2,6-disubstituted 3,6-dihydro-2H-pyrans
作者:J.S. Yadav、V. Sunitha、B.V. Subba Reddy、P.P. Das、E. Gyanchander
DOI:10.1016/j.tetlet.2007.11.177
日期:2008.1
A new method for the stereoselective synthesis of trans-2,6-disubstituted 3,6-dihydro-2H-pyrans with a variety of substitution patterns is described, involving Lewis acid induced tandem allylation or cyanation of δ-hydroxy-α,β-unsaturated aldehydes to produce dihydropyrans in good yields and with trans-selectivity. This method is very useful for the synthesis of trans-2,6-disubstituted dihydropyran
描述了一种立体选择性合成具有多种取代方式的反式2,6-二取代的3,6-二氢-2 H-吡喃的新方法,该方法涉及路易斯酸诱导的δ-羟基-α,β的串联烯丙基化或氰化-不饱和醛以高收率和反选择性产生二氢吡喃。该方法对于合成含反式2,6-二取代的二氢吡喃环的天然产物(如劳来利特,舒菲霉素C等)非常有用。