练习： CH3O CHsQ CH2OH (CH3)2CHNH2+ CA-NHCH(CH3)2 OCH3 OCH3 0 QH+c.cnc5—+ caHg-6-CH.CH-N○0 C6H5 更改！ CH3O CH3O OH (CH3)2CHNH2+ CHCH2-NHCH(CH3)2 OCH3 OCH3(CH3) 2 CHNH2 + CH3O HC O OCH3 O NH + C6 H5 CCH=CHC6 H5 O 练习： (CH3) 2 CHNH2 + CH3 O HC O OCH3 CH3O CHCH2 NHCH(CH3) 2 OH OCH3 CH3O CH NHCH(CH3) 2 CH2OH OCH3 C O C6H5 CH2CH N O C6H5 更改！