N-(4-chloro-3-methyl-5-isoxazolyl)-N-(methoxyethoxy-methyl)thieno[2,3-b]pyridine-3-sulfonamide → N-(4-chloro-3-methyl-5-isoxazolyl)-N-(methoxyethoxy-methyl)-2-[alpha-hydroxy-4,5-(methylenedioxy)-2-(2-{[(1,1-dimethylethyl)dimethylsilyl]oxy}ethyl)benzyl]thieno[2,3-b]pyridine-3-sulfonamide

Participants

Reaction Steps

The title compound was prepared by the method of Example 4(B) using N-(4-chloro-3-methyl-5-isoxazolyl)-N-(methoxyethoxymethyl)thieno-[2,3-b]pyridine-3-sulfonamide (0.64 g, 1.5 mmoles) [Example 4(A)], THF (10 ml), t-BuLi (1.7 M, 1.2 ml, 2.0 mmoles), and 4,5-(methylenedioxy)-2-(2-{[(1,1-dimethylethyl)dimethylsilyl]oxy}ethyl)benzaldehyde (0.71 g, 2.3 mmoles; prepared according to Lin, et al. (1994) J. Am. Chem. Soc. 116:9791-9792). Flash chromatography (40% EtOAc/hexanes) provided 0.51 g (46%) of the title compound as a yellow solid.

Provenance & Evidence