反应详情

A catalytic amount of TsOH monohydrate was added to a suspension of methyl 14′-cyclohexyl-2,2-dimethylspiro[1,3-dioxane-5,7′-indolo[1,2-e][1,5]benzoxazocine]-11′-carboxylate (as prepared in Example 2, Step 3) in MeOH/THF 1:2 (0.03 M) and the solution was stirred at RT for 3 h. Filtration on a pad of neutral alumina with EtOAc afforded after removal of the solvent in vacuo, methyl 14-cyclohexyl-7,7-bis(hydroxymethyl)-7,8-dihydro-6H-indolo[1,2-e][1,5]benzoxazocine-11-carboxylate (quant). Triflic anhydride (2.8 eq) was added at 0° C. to a solution of this material in dry MeCN (0.05M), DIPEA (3.0 eq) was added and the mixture was stirred at 0° C. for 15 min, then further 3.0 eq of DIPEA were added; iPrNH2 (2 eq) was added, the mixture was transferred to a closed vessel and stirring was continued at 70° C. for 4 h. EtOAc was added, the organic phase was washed with water and brine, dried over Na2SO4 and the solvent was removed in vacuo. The residue was hydrolysed with aq. 1N KOH in dioxane (65° C., overnight); evaporation to dryness gave a residue that was purified by RP-HPLC affording the title compound (15%) and 14′-cyclohexyl-1-isopropylspiro[azetidine-3,7′-indolo[1,2-e][1,5]benzoxazocine]-111′-carboxylic acid (4%). 1H NMR (400 MHz, DMSO-d6, 330 K) δ 1.14-1.38 (m, 3H), 1.56-2.04 (m, 7H), 2.64-2.76 (m, 1H), 3.87 (d, J 15.6, 1H), 4.11 (d, J 6.1, 1H), 4.17 (d, J 12.5, 1H), 4.36 (d, J 6.1, 1H), 4.44 (d, J 12.5, 1H), 4.55 (d, J 6.3, 1H), 4.59 (d, J 6.1, 1H), 5.14 (d, J 15.4, 1H), 7.20-7.24 (m, 3H), 7.47 (bt, J 6.6, 1H), 7.66 (d, J 8.3, 1H), 7.85 (d, J 8.3, 1H), 8.38 (s, 1H); MS (ES+) m/z 418 (M+H)+.

1. filtrationFiltration on a pad of neutral alumina with EtOAc
2. customafforded
3. customafter removal of the solvent in vacuo, methyl 14-cyclohexyl-7,7-bis(hydroxymethyl)-7,8-dihydro-6H-indolo[1,2-e][1,5]benzoxazocine-11-carboxylate (quant)
4. stirringthe mixture was stirred at 0° C. for 15 min
5. customthe mixture was transferred to a closed vessel
6. stirringstirring
7. waitwas continued at 70° C. for 4 h
8. washthe organic phase was washed with water and brine
9. dry with materialdried over Na2SO4
10. customthe solvent was removed in vacuo
11. customwas hydrolysed with aq. 1N KOH in dioxane (65° C., overnight)
12. customevaporation to dryness
13. customgave a residue that
14. customwas purified by RP-HPLC