反应详情

To a solution of (3S,4R)-3-hydroxymethyl-4-({isopropyl-[4-methoxy-3-(3-methoxy-propoxy)-benzoyl]-amino}-methyl)-pyrrolidine-1-carboxylic acid tert-butyl ester (2.32 g, 4.69 mmol; Example 10, reaction step H) is subsequently added at −20° C. with stirring NEt3 (1.95 mL, 14.1 mmol) and in a dropwise fashion methane sulfonylchloride (0.423 mL, 5.39 mmol). Stirring is continued for 20 min at −20° C., the mixture is then diluted with CH2Cl2 and the organic layer is washed with 2N HCl, dried (Na2SO4) and evaporated to dryness to give the crude title compound as yellowish oil. TLC, Rf (hexane/AcOEt 1:3)=0.13.

1. washthe organic layer is washed with 2N HCl
2. dry with materialdried (Na2SO4)
3. customevaporated to dryness