1: With iodine; magnesium in tetrahydrofuran 1 h; Heating; 2: With sulfur dioxide in tetrahydrofuran T=-40°C; 0.5 h; 3: With sulfuryl dichloride in tetrahydrofuran T=-40 - 20°C;
参考文献
SmithKline Beecham Corporation
Patent: US5998470 A1, 1999 ;
US 5998470 A