1: With boron trifluoride diethyl etherate in chloroform 1 h; DarknessInert atmosphere; 2: With 2,3-dicyano-5,6-dichloro-p-benzoquinone in chloroform 1 h;
1.1: POCl3 / 0.17 h / 0 °C 1.2: 1.5 h / 0 °C 2.1: 18 percent Spectr. / DBU; MgBr2; air / toluene / 36 h / 115 °C 3.1: 0.220 g / TFA / CH2Cl2 / 1 h / 20 °C View Scheme
参考文献
Journal of Organic Chemistry, , vol. 72, # 13 p. 5008 - 5011
