摘要:
                                NiCl2(dppe)-catalyzed cross-coupling of cinnamaldehyde dithioacetals gave the corresponding geminal dimethylation products in excellent yields.  Allylic ortho thioesters afforded regioselectively the corresponding trimethylation products.  The reaction may occur via an 18-electron pi-allyl intermediate, which undergoes facile reductive elimination to afford the geminal dimethylation product.  Benzylic dithioacetals having an ortho amino group gave 2-isopropylanilines exclusively.  The reaction of benzylic dithioacetals with EtMgBr under the same conditions yielded geminal diethylation products.