反应详情

Batch A: 1H NMR 400 MHz (CDCl3) (d ppm): 6.06 (1H, OCH2O (+)-cephalotaxine) and 5.82 (1H, OCH2O (+)-cephalotaxine); 5.99 (1H, OCH2O (−)-cephalotaxine) and 5.76 (1H, OCH2O (−)-cephalotaxine). Presence of 11±5% de (+)-cephalotaxine. [a]22=−134,02° (c=0,214; CHCl3): calculated rate 25±5% Batch B: slightly racemized (1%) [a]19=−173,3° (c=0,208; CHCl3)