Reacción #55435

Ecuación de reacción

1-(N-benzyloxycarbonyl-3,4,5-trimethoxyanilinomethyl)-6,7-dihydroxy-1,2,3,4-tetrahydroisoquinoline hydrochloride

hydrochloric acid

→

1-(3,4,5-trimethoxyanilinomethyl)-6,7-dihydroxy-1,2,3,4-tetrahydroisoquinoline hydrochloride

Rendimiento 69.9%

Disolventes

acetic acid

Condiciones de reacción

Tratamiento posterior

1. 1
   Temperaturawas refluxed for 1.5 hours in a stream of nitrogen
2. 2
   ConcentraciónThe reaction mixture was concentrated to dryness
3. 3
   Lavadothe residue was washed with ether and acetone
4. 4
   Otrocrystallized with methanol

Procedimiento

A mixture of 1-(N-benzyloxycarbonyl-3,4,5-trimethoxyanilinomethyl)-6,7-dihydroxy-1,2,3,4-tetrahydroisoquinoline hydrochloride (4.4 g), conc. hydrochloric acid (45 ml) and acetic acid (45 ml) was refluxed for 1.5 hours in a stream of nitrogen. The reaction mixture was concentrated to dryness and the residue was washed with ether and acetone and crystallized with methanol to give 1-(3,4,5-trimethoxyanilinomethyl)-6,7-dihydroxy-1,2,3,4-tetrahydroisoquinoline hydrochloride (2.3 g). The product was recrystallized from water to give a pure product, mp 223° to 225° C.

Fuente