反应详情

A solution of N-α-Boc-D-lysine 12 (1.00 g, 4.06 mmol) in CH2Cl2 (20 mL) and MeOH (5.0 mL) was charged with TMS-diazomethane [(CH3)3SiCHN2 0.6 M solution in hexane, 13.5 mL, 8.12 mmol] at 0° C. and stirred at the same temperature for 1 h and at room temperature for another 1 h. The solvent was removed under reduced pressure to afford crude product 14 (1.04 g, crude) as a yellow oil, which was directly used for the next step without further purification: 1H NMR (400 MHz, CD3OD) δ 4.12-4.05 (m, 1H), 3.70 (s, 3H), 2.62 (t, J=7.0 Hz, 2H), 1.82-1.70 (m, 1H), 1.69-1.58 (m, 1H), 1.54-1.32 (m, 4H), 1.43 (s, 9H).

1. customThe solvent was removed under reduced pressure