Abstract:Les spirochromènes azahétérocycliques saturés réagissent avec les agents nucléophiles comme l'eau, l'hydrogène sulfuré et le borohydrure de sodium. Ils subissent alors une ouverture soit de leur partie hétérocyclique azotée, soit de leur partie chroménique, soit des deux simultanément. Quant aux mérocyanines, elles peuvent ětre soit partiellement réduites, soit décomposées par le borohydrure de sodium.
“…89,90 The most useful alkylating agents are those having an excellent leaving group (iodide and p-toluenesulfonate derivatives). [89][90][91][92][93] With less reactive nucleophiles such as bromide, lower yields are obtained (entries 21 and 22). Low molecular weight alkyl halides such as methyl iodide afforded good yields (Table 7, entries 1-16).…”
Section: Synthesis Of Thiazolinium Saltsmentioning
confidence: 99%
“…The thiazolinium salts 200 were simply prepared by N -alkylation of the corresponding thiazolines 199 (Scheme , Table ) under moisture-free conditions. , The most useful alkylating agents are those having an excellent leaving group (iodide and p -toluenesulfonate derivatives). − With less reactive nucleophiles such as bromide, lower yields are obtained (entries 21 and 22). Low molecular weight alkyl halides such as methyl iodide afforded good yields (Table , entries 1−16).…”
Section: Reactivity and Synthetic Applications Of 2-thiazolinesmentioning
“…89,90 The most useful alkylating agents are those having an excellent leaving group (iodide and p-toluenesulfonate derivatives). [89][90][91][92][93] With less reactive nucleophiles such as bromide, lower yields are obtained (entries 21 and 22). Low molecular weight alkyl halides such as methyl iodide afforded good yields (Table 7, entries 1-16).…”
Section: Synthesis Of Thiazolinium Saltsmentioning
confidence: 99%
“…The thiazolinium salts 200 were simply prepared by N -alkylation of the corresponding thiazolines 199 (Scheme , Table ) under moisture-free conditions. , The most useful alkylating agents are those having an excellent leaving group (iodide and p -toluenesulfonate derivatives). − With less reactive nucleophiles such as bromide, lower yields are obtained (entries 21 and 22). Low molecular weight alkyl halides such as methyl iodide afforded good yields (Table , entries 1−16).…”
Section: Reactivity and Synthetic Applications Of 2-thiazolinesmentioning
Aus dem Salicylaldehyd (II) und den Salzen (I) werden in Gegenwart von Piperidin die spirocyclischen Kondensate (III) hergestellt und dann zu (IV) verseift.
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