反应详情

A 1.60 g portion of ethyl 7-(2-chloroethoxy)-6-methoxy-3-nitro-2-naphthoate and ethyl 6-(2-chloroethoxy)-7-methoxy-3-nitro-2-naphthoate (1:1 mixture) is heated in 100 mL absolute ethanol until dissolved. The solution is allowed to cool to room temperature and 0.2 g of 10% palladium on carbon is added. Hydrogenation is carried out in a Parr apparatus at 50 psi for 2 hours. The reaction mixture is filtered through celite and the filter cake is rinsed with ethanol. The filtrate and washes are combined and evaporated to give ethyl 3-amino-7-(2-chloroethoxy)-6-methoxy-2-naphthoate and ethyl 3-amino-6-(2-chloroethoxy)-7-methoxy-2-naphthoate (1:1 mixture) as a greenish yellow solid, 1.28 g (87%), m.p. 104–8° C.

1. dissolutionuntil dissolved
2. filtrationThe reaction mixture is filtered through celite
3. washthe filter cake is rinsed with ethanol
4. customevaporated