CHO LIAIH OH OH 1)A(Pr)3 H NH-CHC2H° H、CHC2 Mg H2o R R R R2r R2r OH COOMe LIAIH 2)H3O OH HO OH HO OHCHO LiAlH4 H3O OH OH O2N O NH O CHCl2 Al(Pr-i)3 H3O OH O2N NH O CHCl2 OH 1) 2) R1 R2 O Mg O Mg O R1 R2 R1 R2 H2O HO OH R1 R2 R1 R2 COOH HO OH COOMe HO OH LiAlH4 H3O 1) 2) HO OH OH