Improvement in the method for the preparation of N-(3,4-dimethoxyphenylethyl)-3′,4′-dimethoxyphenylacetamide
The synthesis of I was first described in 1909 [i]. At present several methods are known for the preparation of this compound, starting from 3,4-dimethoxyphenylethylamine (If) and 3,4-dimethoxyphenylacetic acid (III) or its acid chloride (IV) [2-4]. The use of IV makes it possible to obtain I in a yield of up to 95% [5, 6], but this method cannot be used industrially because of considerable complications of the industrial process.
Practical preparation of coralyne chloride.
Abstract Coralyne chloride was prepared by a convenient process which can be adapted to large-scale synthesis of this antileukemic alkaloid.
Mannich and eschweiler-clarke reaction of 1-benzyl-1,2,3,4-tetrahydroisoquinolines. Studies on the syntheses of heterocyclic compounds. Part CCCXVIII†
Modified Mannich reactions of a number of 1-benzyl-1,2,3,4-tetrahydroisoquinolines (Ia-Ie) were attempted to afford the corresponding protoberberine derivatives (IIa-IIe) in good yield. Treatment of both If and Ig with formalin under a variety of Mannich or Eschweiler-Clarke conditions did not give the expected protoberberine derivatives IIf and IIg, but afforded the N-methyl derivatives (VIIa) and (VIIb), respectively.