反应详情

To a solution of (+)-methyl 5-(3-(2-(7-chloroquinolin-2-yl)ethenyl)phenyl)-8-dimethylcarbamyl-4,6-dithiaoctanoate (step 4) (640 mg, 1.21 mmol.) in peroxide free 1,2-dimethoxyethane (15 mL) and water (1.5 mL) was added LiOH (1M, 1.8 mL, 1.8 mmol.). The solution was stirred for 3 hrs at room temperature Water was added and the mixture was washed with EtOAc. The aqueous layer was acidified with 1N HCl, extracted with EtOAC, the extracts were washed with brine (2×), dried over Na2SO4, filtered and evaporated to dryness. The oily residue was coevaporated 3 or 4 times with EtOAc and finally was allowed to crystallize in this solvent overnight at 0° C. Filtration afforded the title compound.

1. additionwas added
2. washthe mixture was washed with EtOAc
3. extractionextracted with EtOAC
4. washthe extracts were washed with brine (2×)
5. dry with materialdried over Na2SO4
6. filtrationfiltered
7. customevaporated to dryness
8. customto crystallize in this solvent overnight at 0° C
9. filtrationFiltration