{"id":925,"date":"2011-01-24T16:49:00","date_gmt":"2011-01-24T16:49:00","guid":{"rendered":"https:\/\/psiconautica.org\/wordpress\/?p=925"},"modified":"2022-01-31T12:06:00","modified_gmt":"2022-01-31T12:06:00","slug":"iodination-of-methoxyamphetamines-with-iodine-and-silver-sulfate","status":"publish","type":"post","link":"https:\/\/psiconautica.org\/wordpress\/quimica-avanzada\/iodination-of-methoxyamphetamines-with-iodine-and-silver-sulfate\/","title":{"rendered":"Iodination of Methoxyamphetamines with Iodine and Silver Sulfate"},"content":{"rendered":"

Iodination of Methoxyamphetamines with Iodine and Silver Sulfate.<\/h2>\n

<\/h5>\n

Abstract:<\/h3>\n

lodination of metboxyamphetamines with iodine\/silver sulfate at room temperature gives iodomethoxyamphetamines in good yield.<\/h5>\n

 <\/p>\n

Theory:<\/h3>\n

Radioiodo-labelled amphetamines are widely used in brain imaging and therefore are of great value in medicinal chemistry. The synthesis of iodoamphetamine is difficult because iodine is the least reactive halogen in electrophilic aromatic substitution. 1<\/a> \u00a0Also, because the amine group can interfere in a number of reactions such as oxidative halogenation; protection of the amine group is usually required for the iodination procedure. lodoamphetamines have been synthesized by the use of IC1,2<\/a> chloramine T,3<\/a> silver trifluoroacetate,4<\/a> iododediazotization5<\/a> and iododeboration.6<\/a><\/h5>\n

 <\/p>\n

It was reported that direct iodination of 2,5 dimethoxy-N,N-dimethylamphetamine by chloramine T was unsuccessful because the ring is not sufficiently activated.3a<\/a>\u00a0 An attempt to iodinate the 2,5-dimethoxyamphetamine by IC1 resulted in an oxidative attack on the amine group.2b<\/a>\u00a0 A low yield was obtained by direct iodination of the N-acetyl derivative of 2,5-dimethoxyamphetamine with iodine and silver trifluoroacetate.4<\/a><\/p>\n

Recently, it was found in our laboratories that iodine \/ silver sulfate is an excellent iodination reagent. This reagent has been used for iodinating alkyl and alkoxybenzenes,7<\/a> aromatic amines8<\/a> and uridines.9<\/a><\/p>\n

The iodine \/ silver sulfate system has now been applied to the syntheses of iodomethoxy-amphetamines. The results are presented in this report.<\/p>\n

Methoxyaniphetamines can he iodinated with iodine \/ silver sulfate at room temperature in ethanol (scheme 1). Protecting the amino group is not necessary under these conditions, and high yields are obtained. However, under similar conditions, there is no reaction with methylamphetamines or amphetamine.<\/p>\n

Results are summarized in Table 1.<\/a><\/p>\n

A representative iodination was performed as follows:<\/p>\n

Example of method<\/h3>\n
4-methoxyamphetamine (165 mg, 1mM) was added to a mixture of iodine (508 mg, 2mM) and silver sulfate (622 mg, 2mM) in ethanol (20 mL) at room temperature. The mixture was stirred for 17 hours. After this time, the yellow solid was removed by filtration and the filtrate was evaporated to dryness under reduced pressure. The residue was dissolved in chloroform and washed with aqueous 5% NaOH solution, then with water. After separation, the organic layer was dried over sodium sulfate and evaporated to dryness. The residue was chromatographed on silica gel and eluted with 8% ethanol \/ chloroform to give pure 3-iodo-4-methoxyamphetamine (250 mg, 86%).<\/h5>\n

 <\/p>\n

Table: lodination of Methoxyamphetamines with Iodine and Silver Sulfate<\/h3>\n

<\/h5>\n

Substrate10<\/a> (Amphetamine)<\/p>\n

Yield (%)<\/p>\n

Product11<\/a> (Amphetamine) 2-Methoxy-<\/p>\n

83<\/p>\n

5-Iodo-2-Methoxy- 3-Methoxy-<\/p>\n

77<\/p>\n

2-Iodo-5-Methoxy- 4-Methoxy-<\/p>\n

86<\/p>\n

3-Iodo-4-Methoxy- 2,4-Dimethoxy-<\/p>\n

80<\/p>\n

2,4-Dimethoxy-5-iodo- 2,5-Dimethoxy-<\/p>\n

78<\/p>\n

2,5-Dimethoxy-4-iodo- 2,6-Dimethoxy-<\/p>\n

84<\/p>\n

2,6-Dimethoxy-3-iodo- 3,5-Dimethoxy-<\/p>\n

88<\/p>\n

3,5-Dimethoxy-2-iodo-<\/p>\n

References<\/h3>\n
1.\u00a0 March, J. Advanced Organic Chemistry,<\/i> 4th. Ed., Wiley-Interscience: New York. 1992; pp. 533-534.
\n2. a). \u00a0Sargent Ill, T.; Shulgin, A.T.; Mathis, C.A. J. Med. Chem., <\/i>1984<\/b>, 27, 1071-1077.
\nb). \u00a0Braun, U.; Shulgin, A.T.; Braun, G.; Sargent III, T. J. Med. Chem., 1977, 20, 1543-1546.
\n3.\u00a0 a). \u00a0Mathis, C.A.; Shulgin, A.T.; Sargent Ill, T. J. Labelled Compds. Radiopharm., <\/i>1986<\/b>, 23, 115-125.
\nb). \u00a0Mathis, C.A.; Hoffrnan, AJ; Nichols, D.E.; Shulgin, A.T. J. Labelled Compds. Radiopharm.<\/i>,
\n1988<\/b>, 25, 1255-1265.
\n4. \u00a0Glennon, R.A.; Young, R.; Benington, F.; Morin, R.D. J. Med. Chem., <\/i>1982<\/b> , 25, 1163-1168.
\n5. \u00a0Protiva, J.; Krecek, V.; Leseticky, L. J. Radioanal. Nucl. Chem., Letters<\/i>, 1986<\/b> , 107, 331-336.
\n6. \u00a0Kabalka, G.W.; Varma, R.S.; Gai, Y-Z.; Baldwin, M. Tetrahedron Lett.<\/i>, 1986<\/b> , 27, 3843-3844.
\n7. \u00a0Sy, W.-W.; Lodge, B.A.; By, A.W. Synth. Commun. <\/i>1990<\/b> , 20, 877-880.
\n8. \u00a0Sy, W.-W. Synth. Commun<\/i>. 1992<\/b> , 22, 3215-3219.
\n9. \u00a0Sy, W.-W. Synth. Commun. <\/i>1990<\/b> , 20, 3391-3394.
\n10. For an improved synthetic procedure of the synthesis of amphetamines from styrenes, see: Sy, W. -W.;
\nBy, A.W. Tetrahedron Lett. <\/i>1985<\/b> , 26, 1193-1196.
\n11.All products were characterized by NMR, IR and MS and structures assigned by 13C and 1H NMR.
\n12.Pharmaceutical Chemistry Division, Bureau of Drug Research, Health Protection Branch, Health and
\nWelfare Canada. Tunney’s Pasture, Ottawa, Ontario, Canada K1A 0L2.<\/h5>\n

 <\/p>\n

Acknowledgements:<\/h3>\n

the author thanks Dr. B.A. Lodge for helpful discussions, Messrs. B, Black, JC. Ethier and H. Beckstead of our laboratories for provision of NMR, MS, and IR spectra, respectively, and K. Graham for some experimental work.<\/p>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

Iodination of Methoxyamphetamines with Iodine and Silver Sulfate. Abstract: lodination of metboxyamphetamines with iodine\/silver sulfate at room temperature gives iodomethoxyamphetamines in good yield.   Theory: Radioiodo-labelled amphetamines are widely used in brain imaging and therefore are of great value in medicinal chemistry. The synthesis of iodoamphetamine is difficult because iodine is the least reactive halogen […]<\/p>\n","protected":false},"author":1,"featured_media":1644,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[24],"tags":[],"class_list":["post-925","post","type-post","status-publish","format-standard","has-post-thumbnail","category-quimica-avanzada"],"yoast_head":"\nIodination of Methoxyamphetamines with Iodine and Silver Sulfate - Psicon\u00e1utica<\/title>\n<meta name=\"robots\" content=\"noindex, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<meta property=\"og:locale\" content=\"es_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Iodination of Methoxyamphetamines with Iodine and Silver Sulfate - Psicon\u00e1utica\" \/>\n<meta property=\"og:description\" content=\"Iodination of Methoxyamphetamines with Iodine and Silver Sulfate. Abstract: lodination of metboxyamphetamines with iodine\/silver sulfate at room temperature gives iodomethoxyamphetamines in good yield.   Theory: Radioiodo-labelled amphetamines are widely used in brain imaging and therefore are of great value in medicinal chemistry. The synthesis of iodoamphetamine is difficult because iodine is the least reactive halogen […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/psiconautica.org\/wordpress\/quimica-avanzada\/iodination-of-methoxyamphetamines-with-iodine-and-silver-sulfate\/\" \/>\n<meta property=\"og:site_name\" content=\"Psicon\u00e1utica\" \/>\n<meta property=\"article:published_time\" content=\"2011-01-24T16:49:00+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2022-01-31T12:06:00+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/psiconautica.org\/wordpress\/wp-content\/uploads\/2020\/08\/quimica-default1200.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"800\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Ra\u00fal del Pino\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Escrito por\" \/>\n\t<meta name=\"twitter:data1\" content=\"Ra\u00fal del Pino\" \/>\n\t<meta name=\"twitter:label2\" content=\"Tiempo de lectura\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 minutos\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/psiconautica.org\\\/wordpress\\\/quimica-avanzada\\\/iodination-of-methoxyamphetamines-with-iodine-and-silver-sulfate\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/psiconautica.org\\\/wordpress\\\/quimica-avanzada\\\/iodination-of-methoxyamphetamines-with-iodine-and-silver-sulfate\\\/\"},\"author\":{\"name\":\"Ra\u00fal del Pino\",\"@id\":\"https:\\\/\\\/psiconautica.org\\\/wordpress\\\/#\\\/schema\\\/person\\\/3afbb90b66878c42e9d66e8e261f3d29\"},\"headline\":\"Iodination of Methoxyamphetamines with Iodine and Silver Sulfate\",\"datePublished\":\"2011-01-24T16:49:00+00:00\",\"dateModified\":\"2022-01-31T12:06:00+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/psiconautica.org\\\/wordpress\\\/quimica-avanzada\\\/iodination-of-methoxyamphetamines-with-iodine-and-silver-sulfate\\\/\"},\"wordCount\":650,\"commentCount\":0,\"image\":{\"@id\":\"https:\\\/\\\/psiconautica.org\\\/wordpress\\\/quimica-avanzada\\\/iodination-of-methoxyamphetamines-with-iodine-and-silver-sulfate\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/psiconautica.org\\\/wordpress\\\/wp-content\\\/uploads\\\/2020\\\/08\\\/quimica-default1200.jpg\",\"articleSection\":[\"Qu\u00edmica avanzada\"],\"inLanguage\":\"es\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/psiconautica.org\\\/wordpress\\\/quimica-avanzada\\\/iodination-of-methoxyamphetamines-with-iodine-and-silver-sulfate\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/psiconautica.org\\\/wordpress\\\/quimica-avanzada\\\/iodination-of-methoxyamphetamines-with-iodine-and-silver-sulfate\\\/\",\"url\":\"https:\\\/\\\/psiconautica.org\\\/wordpress\\\/quimica-avanzada\\\/iodination-of-methoxyamphetamines-with-iodine-and-silver-sulfate\\\/\",\"name\":\"Iodination of Methoxyamphetamines with Iodine and Silver Sulfate - 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