反应条件
1: 17β-((N,N-dimethyl-carbamyl)-thio)formoxyl-6α,9α-difluoro-11β-hydroxyl-16α-methyl-17α-propionyloxy-3-oxoandrosta-1,4-diene With sodium hydrogensulfide in isobutyramide T=0 - 20°C; 4 h; 2: fluoromethyl bromide in isobutyramide T=-5°C; 1 h; 3: With dihydrogen peroxide in isobutyramide; water T=20°C; 0.5 h; Product distribution / selectivity;