methyl (2R,3S)-4-((((9H-fluoren-9-yl)methoxy)carbonyl)-D-valyl)-6-methoxy-2-methylmorpholine-3-carboxylate 在
对甲苯磺酸 作用下,
以
甲苯 为溶剂,
反应 2.0h,
生成
methyl (2R,3S)-4-[(2R)-2-(9H-fluoren-9-ylmethoxycarbonylamino)-3-methylbutanoyl]-2-methyl-2,3-dihydro-1,4-oxazine-3-carboxylate