合成路线:It can be prepared in three different,but related ways:1) The chloromethylation of 8-methoxycoumarin (I) with formaldehyde and HCl in refluxing acetic acid gives 5-chloromethyl-8-methoxycoumarin (II),which is reduced with H2 over Pd/C in DMF yielding 5-methyl-8-methoxycoumarin (III).The hydrolysis of (III) with refluxing 48% aqueous HBr affords 5-methyl-8-hydroxycoumarin (IV),which is condensed with epibromohydrin (A) by means of K2CO3 in refluxing butanone giving 5-methyl-8-(2,3-epoxypropoxy)coumarin (V).The epoxy ring of (V) is opened with HCl in butanone affording 5-methyl-8-(2-hydroxy-3-chloropropoxy)coumarin (VI) (1),which is finally condensed with tert-butylamine (B) in refluxing ethanol (1-3).2) The cyclization of 5-methylguaiacol (VII) with malic acid (VIII) by means of H2SO4 at 100-5 C gives coumarin (III) already obtained (1).3) The condensation of (IV) with epichlorohydrin (C) by means of piperidine at 100 C gives coumarin (VI) already obtained (1).
参考文献标题:
文献作者:
参考来源:DE 2021958; FR 2042378; GB 1263204; JP 7240051
合成路线:It can be prepared in three different,but related ways:1) The chloromethylation of 8-methoxycoumarin (I) with formaldehyde and HCl in refluxing acetic acid gives 5-chloromethyl-8-methoxycoumarin (II),which is reduced with H2 over Pd/C in DMF yielding 5-methyl-8-methoxycoumarin (III).The hydrolysis of (III) with refluxing 48% aqueous HBr affords 5-methyl-8-hydroxycoumarin (IV),which is condensed with epibromohydrin (A) by means of K2CO3 in refluxing butanone giving 5-methyl-8-(2,3-epoxypropoxy)coumarin (V).The epoxy ring of (V) is opened with HCl in butanone affording 5-methyl-8-(2-hydroxy-3-chloropropoxy)coumarin (VI) (1),which is finally condensed with tert-butylamine (B) in refluxing ethanol (1-3).2) The cyclization of 5-methylguaiacol (VII) with malic acid (VIII) by means of H2SO4 at 100-5 C gives coumarin (III) already obtained (1).3) The condensation of (IV) with epichlorohydrin (C) by means of piperidine at 100 C gives coumarin (VI) already obtained (1).
参考文献标题:Studies on new B-adrenergic blocking agents.I.Syntheses and pharmacology of coumarin derivatives
文献作者:Sato,Y.; et al.
参考来源:Chem Pharm Bull 1972,20(5),905-917
合成路线:It can be prepared in three different,but related ways:1) The chloromethylation of 8-methoxycoumarin (I) with formaldehyde and HCl in refluxing acetic acid gives 5-chloromethyl-8-methoxycoumarin (II),which is reduced with H2 over Pd/C in DMF yielding 5-methyl-8-methoxycoumarin (III).The hydrolysis of (III) with refluxing 48% aqueous HBr affords 5-methyl-8-hydroxycoumarin (IV),which is condensed with epibromohydrin (A) by means of K2CO3 in refluxing butanone giving 5-methyl-8-(2,3-epoxypropoxy)coumarin (V).The epoxy ring of (V) is opened with HCl in butanone affording 5-methyl-8-(2-hydroxy-3-chloropropoxy)coumarin (VI) (1),which is finally condensed with tert-butylamine (B) in refluxing ethanol (1-3).2) The cyclization of 5-methylguaiacol (VII) with malic acid (VIII) by means of H2SO4 at 100-5 C gives coumarin (III) already obtained (1).3) The condensation of (IV) with epichlorohydrin (C) by means of piperidine at 100 C gives coumarin (VI) already obtained (1).
参考文献标题:Bucumolol
文献作者:Castar,J.; Weetman,D.F.
参考来源:Drugs Fut 1978,3(9),638
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