反应详情

(S)-methyl-2-(benzyloxycarbonylamino)-2,3-dihydro-1H-indene-5-carboxylate (15.37 mmol, 5.00 g) was dissolved in THF (50 mL) and the vessel purged with nitrogen. Lithium Borohydride (2M, 30.7 mmol, 15.37 mL) was added dropwise followed by methanol (30.7 mmol, 0.985 g). The solution was stirred at room temperature for 6 h before additional lithium borohydride (2M, 15.35 mmol, 7.69 mL) was added. Stirring was continued overnight. A further amount of lithium borohydride was added (2M, 15.35 mmol, 7.69 mL) and stirring continued for 1 h. The reaction was quenched with MeOH then water and concentrated to a light brown residue. This was partitioned between EtOAc (150 mL) and 1N HCl (150 mL) and the phases mixed and separated. The aqueous layer was twice extracted with ethylacetate and combined organics dried, filtered and concentrated to give a brown gum which was dissolved in MeOH (100 mL) and stirred with activated carbon. Filtration through a dicalite pad followed by concentration and purification on silica eluting with 0-2% MeOH/DCM gave (S)-benzyl 5-(hydroxymethyl)-2,3-dihydro-1H-inden-2-ylcarbamate as a beige solid (2.2, 48%). 1H NMR (400 MHz, CDCl3) δ 1.66 (t, 1H) 2.81 (m, 2H) 3.28 (m, 2H) 4.52 (bs, 1H) 4.65 (d, 2H) 4.95 (bs, 1H) 5.09 (bs, 2H) 7.15-7.37 (bm, 8H).

1. customthe vessel purged with nitrogen
2. additionwas added
3. stirringstirring
4. waitcontinued for 1 h
5. customThe reaction was quenched with MeOH
6. concentrationwater and concentrated to a light brown residue
7. customThis was partitioned between EtOAc (150 mL) and 1N HCl (150 mL)
8. additionthe phases mixed
9. customseparated
10. extractionThe aqueous layer was twice extracted with ethylacetate
11. filtrationfiltered
12. concentrationconcentrated
13. customto give a brown gum which
14. stirringstirred with activated carbon
15. filtrationFiltration through a dicalite pad
16. concentrationfollowed by concentration and purification on silica eluting with 0-2% MeOH/DCM