实验事实 TSCI CH2C00 HO-H Pyridine OTs Aco H al=+33.0 a]=+31.1 a]=-7.06 0 H,O OH H,O OH CH3CO0 T SCl OAc so H Pyridine H-O a|=+7060 [al=-33.0 a=-3.0实验事实 H O-H TsCl Pyridine H OTs [ a ] = +33.0 0 [ a ] = +31.1 0 AcO H [ a ] = - 7.06 0 H OAc [ a ] = + 7.06 0 H-O H [ a ] = - 33.0 0 CH3 COO - H2O OH - TsO H [ a ] = - 33.0 0 Pyridine TsCl CH3 COO - H2O OH -