N-[(4R,5R)-4-(1,3-benzodioxol-5-yl)-2,2-dimethyl-1,3-dioxan-5-yl]-3,4,5-trimethoxybenzamide 在
PPSE(trimethylsylilpolyphosphate) in CH
2Cl
2 作用下,
以
吡啶 为溶剂,
反应 18.0h,
以73%的产率得到(4aR,11bS)-2,2-Dimethyl-6-(3,4,5-trimethoxy-phenyl)-4a,11b-dihydro-4H-1,3,8,10-tetraoxa-5-aza-cyclopenta[b]phenanthrene