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Braun U, Shulgin AT, Braun G. 
“Centrally active N-substituted analogs of 3,4- methylenedioxyphenylisopropylamine (3,4-methylenedioxyamphetamine)”. 
J Pharm Sci. 1980;69(2):192-5.
The known central nervous system activity of 3,4- methylenedioxyphenylisopropylamine and its N-methyl homolog prompted the synthesis of a series of analogs with substituents on the nitrogen atom. Most of these analogs (R = alkyl, alkenyl, hydroxy, alkoxy, and alkoxyalkyl) were prepared by the reductive alkylation of 3,4- methylenedioxyphenylacetone with the appropriate amine and sodium cyanoborohydride. Hindered isomers were synthesized indirectly. Measurements of their pharmacological activity in several animal assays and in human subjects indicated that the central activity decreased with the increasing bulk of the N-substituent.
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