反应详情

A solution of 20 g (77.7 mmol) of BOC-tranexamic acid in 162 mL of DMA and 320 mL of THF was cooled to 0° C. and treated with 7.46 g (170.99 mmol, 2.2 eq) of NaH (55% in oil) over 30 min. The mixture was warmed to RT, cooled to 0° C. again and treated with 77.42 mL (1243 mmol, 16 eq) of CH3I and warmed to RT overnight. 230 mL (2487.1 mmol, 32 eq) of aqueous 32% NaOH were added at 0° C., the solution was stirred for 1 h at RT and partitioned between Et2O (×3)/H2O. The organic phase was evaporated to remove the DMA. The residue was dissolved in 100 mL of dioxane and treated with 233 mL (233 mmol) of aqueous 1M NaOH at RT, and the solution was stirred overnight. The reaction was partitioned between Et2O (×3)/H2O, the aqueous phase was acidified with aqueous 10% KHSO4 and partitioned between Et2O (×3), washed once with aqueous 10% NaCl, dried over Na2SO4 and evaporated to yield 19.2 g (87%) of trans-4-[(tert-butoxycarbonyl-methyl-amino)-methyl]-cyclohexane-carboxylic acid, MS: 270 (M−H−).

1. temperaturecooled to 0° C. again
2. temperaturewarmed to RT overnight
3. custompartitioned between Et2O (×3)/H2O
4. customThe organic phase was evaporated
5. customto remove the DMA
6. dissolutionThe residue was dissolved in 100 mL of dioxane
7. additiontreated with 233 mL (233 mmol) of aqueous 1M NaOH at RT
8. stirringthe solution was stirred overnight
9. customThe reaction was partitioned between Et2O (×3)/H2O
10. custompartitioned between Et2O (×3)
11. washwashed once with aqueous 10% NaCl
12. dry with materialdried over Na2SO4
13. customevaporated