反应 #4793

反应方程式

diisopinocampheylborane

alpha pinene

borane

tetrahydroisoquinoline

→

pinene

溶剂

tetrahydrofuran

tetrahydrofuran

tetrahydrofuran

反应条件

后处理

1. 1
   其他is obtained

实验过程

Another way to accomplish this assymetric reduction of compound 4' to optically active tetrahydroisoquinolines is to reduce the compound in tetrahydrofuran with the reagent which is obtained by reacting 2 moles of optically active alpha pinene with borane in tetrahydrofuran. The solution of the diisopinocampheylborane functions as the reducing agent in the reduction of the intermediate 4' to chiral tetrahydroisoquinoline. Basically, the compound 4' is treated with a slight excess of this reagent produced from optically active pinene and BH3 in tetrahydrofuran followed by evaporation and treatment with HCl which decomposes a complex and gives the hydrochloride of the tetrahydroisoquinoline in the aqueous phase. The base can then be recovered from the aqueous phase by treatment with ammonia and methanol as above.

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