Methanesulfonyl chloride → 3-(tert-butyloxycarbonyl)-1-[(methanesulfonyloxy)methyl]-5-nitro-1,2-dihydro-3H-benz[e]indole

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A stirred solution of 3-(tert-butyloxycarbonyl)-1-(hydroxymethyl)-5-nitro-1,2-dihydro-3H-benz[e]indole (12) (450 mg, 1.31 mmol) in pyridine (1.3 mL) was treated dropwise at -5° C. with methanesulfonyl chloride (0.121 mL, 1.57 mmol) and then stirred at 20° C. for 2 h. The mixture was diluted with water then cooled and the resulting solid collected, washed with water and dried. This product was dissolved in CH2Cl2 and the solution was filtered through a short column of silica gel, eluting with further CH2Cl2. The resulting product was triturated with iPr2O/petroleum ether to give 3-(tert-butyloxycarbonyl)-1-[(methanesulfonyloxy)methyl]-5-nitro-1,2-dihydro-3H-benz[e]indole (494 mg, 89%), mp 147° C. (dec.). 1H NMR [(CD3)2SO] δ 8.75 (br s, 1 H, H-4), 8.32 (d, J=8.5 Hz, 1 H, H-6), 8.12 (d, J=8.2 Hz, 1 H, H-9), 7.77-7.63 (m, 2 H, H-7, 8), 4.54 (dd, J=10.0, 3.7 Hz, 1 H, H-2), 4.43 (dd, J=10.0, 6.4 Hz, 1 H, H-2), 4.42-4.33 (m, 1 H, H-1), 4.25 (t, J=10.3 Hz, 1 H, CHHO), 4.14 (dd, J=11.4, 2.5 Hz, 1 H, CHHO), 3.11 (s, 3 H, SO2CH3), 1.56 (s, 9 H, C(CH3)3). Anal. Calculated for C19H22N2O7S: C, 54.0; H, 5.3; N, 6.6; S, 7.6. Found: C, 54.3; H, 5.4; N, 6.9; S, 7.4%.

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