Mild, asymmetric Diels-Alder cycloadditions of electronically matched 2-pyrones and vinyl ethers
作者:Gary H. Posner、Jean-Christophe Carry、Jae Kyoo Lee、D.Scott Bull、Haiyan Dai
DOI:10.1016/s0040-4039(00)76207-1
日期:1994.2
Silica gel and a TADDOL-complexed titanium IV Lewis acid are shown to promote mild, practical, asymmetric [4+2]-cycloadditions of electron-poor 2-pyrone-3-carboxylates with electron-rich vinyl ethers to form isolable and useful bicyclic lactone adducts.