反应详情

Using analogous reaction condition and reagents as described in Example 25 for the preparation of I-25a above, 4-bromo-2,5-difluoro-benzaldehyde (I-27a: 1.71 g, 7.73 mmol) was reacted with TEA (1.4 mL, 10.05 mmol), mercapto-acetic acid methyl ester (920 mg, 8.51 mmol) and acetonitrile (50 mL) to afford crude product. Purification by column chromatography on silica gel (5% ethyl acetate in hexane) afforded 2.3 g of the product (Yield 64%).

1. customto afford crude product
2. customPurification by column chromatography on silica gel (5% ethyl acetate in hexane)