(5S,6R)-5-acetoxy-6-(acetoxymethyl)-5,6-dihydro-2H-pyran-2-one 、
靛红 、
六氢吡啶-alpha-羧酸 以
甲苯 为溶剂,
反应 12.0h,
以80%的产率得到((3S,3'R,4'S,4a'R,4b'S,10a'S)-4'-acetoxy-1',2-dioxo-1',3',4',4a',4b',5',6',7',8',10a'-decahydrospiro[indoline-3,10'-pyrano[4,3-a]indolizine]-3'-yl)methyl acetate