Reaction of (Z)-β-siloxyacrylonitriles 1 with enones 2 afforded 4H-pyrans 3 and dihydro-2H-pyrans 4 regio- and stereoselectively. A concerted hetero-Diels-Alder process is proposed.
将(Z)-δ-
硅氧
丙烯腈 1 与烯酮 2 反应,可得到 4H
吡喃 3 和二氢-
2H-吡喃 4,具有区域和立体选择性。提出了一种协同的杂-Diels-Alder 过程。