Synthesis of 4-thia analogues of isoquinoline alkaloids

János Szabó, Ágnes Katócs, G. Bernáth, P. Sohár

Research output: Contribution to journalArticle

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Abstract

(±)-4-Thiacarnegin (3) was synthesized by reaction of 6,7-dimethoxy-3-methyl-2 H-1,3-benzothiazinium iodide (2) with methyl magnesium iodide, thereby opening a new synthetic route to 4-substituted dihydro-2 H-1,3-benzothiazines. Compound 3 was also obtained by reduction of 6,7-dimethoxy-3,4-dimethyl-2 H-1,3-benzothiazinium iodide (5). In a similar way, reduction of the quaternary salts 9 a-c afforded the (±)-4-thia analogues of cryptostilin-I, -II and -III (10 a-c). The isomers of the former compounds (12 a-c) were also synthesized by reduction of the 4 H-1,3-benzothiazinium salts 11 a-c.

Original languageEnglish
Pages (from-to)463-471
Number of pages9
JournalMonatshefte fur Chemie
Volume120
Issue number5
DOIs
Publication statusPublished - May 1989

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Alkaloids
Iodides
Salts
Isomers
isoquinoline

Keywords

  • 2 H-1,3-Benzothiazines
  • 3,4-Dihydro-2 H-1,3-benzothiazines
  • 4 H-1,3-Benzothiazines

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

Synthesis of 4-thia analogues of isoquinoline alkaloids. / Szabó, János; Katócs, Ágnes; Bernáth, G.; Sohár, P.

In: Monatshefte fur Chemie, Vol. 120, No. 5, 05.1989, p. 463-471.

Research output: Contribution to journalArticle

Szabó, János ; Katócs, Ágnes ; Bernáth, G. ; Sohár, P. / Synthesis of 4-thia analogues of isoquinoline alkaloids. In: Monatshefte fur Chemie. 1989 ; Vol. 120, No. 5. pp. 463-471.
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AU - Katócs, Ágnes

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AB - (±)-4-Thiacarnegin (3) was synthesized by reaction of 6,7-dimethoxy-3-methyl-2 H-1,3-benzothiazinium iodide (2) with methyl magnesium iodide, thereby opening a new synthetic route to 4-substituted dihydro-2 H-1,3-benzothiazines. Compound 3 was also obtained by reduction of 6,7-dimethoxy-3,4-dimethyl-2 H-1,3-benzothiazinium iodide (5). In a similar way, reduction of the quaternary salts 9 a-c afforded the (±)-4-thia analogues of cryptostilin-I, -II and -III (10 a-c). The isomers of the former compounds (12 a-c) were also synthesized by reduction of the 4 H-1,3-benzothiazinium salts 11 a-c.

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