1: 6,7-dimethoxy-3,4-dihydro-1H-isochromene With 2,3-dicyano-5,6-dichloro-p-benzoquinone; bis-[(trifluoroacetoxy)iodo]benzene in 1,2-dichloro-ethane T=80°C; 3 h; Inert atmosphere; 2: PhMgI in diethyl ether; 1,2-dichloro-ethane T=-20°C; 3 h; Inert atmosphere;