[rhenium(pentacarbonyl)(bromide)]; methylenecarboxanilide in toluene T=180°C; 24 h; Inert atmosphere;

1: 1-phenyl-2-(phenylsulfonyl)ethanone With sodium hydride in tetrahydrofuran T=20°C; 0.166667 h; 2: o-(trimethylsilyl)phenyl triflate; maleic acid diethyl ester With potassium fluoride; 18-crown-6 ether in tetrahydrofuran T=65°C; Further stages.;

1: 1-phenyl-2-tosylethanone With sodium hydride in tetrahydrofuran T=20°C; 0.166667 h; 2: o-(trimethylsilyl)phenyl triflate; maleic acid diethyl ester With potassium fluoride; 18-crown-6 ether in tetrahydrofuran T=65°C; Further stages.;

3-Amino-4H-thieno[3,4-d]naphtho[2,1-b]pyran-4-one in N,N-dimethyl-formamide 7 h; Heating;