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Instituto de Investigacion y Desarrollo Quimico Biologico SA
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Instituto de Investigacion y Desarrollo Quimico Biologico SA
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Publication date
Application filed by Instituto de Investigacion y Desarrollo Quimico Biologico SAfiledCriticalInstituto de Investigacion y Desarrollo Quimico Biologico SA
Priority to ES542943ApriorityCriticalpatent/ES542943A0/en
Publication of ES8603886A1publicationCriticalpatent/ES8603886A1/en
Publication of ES542943A0publicationCriticalpatent/ES542943A0/en
3-Alkyl xanthenes are made by (a) reacting 4,5-diamino uracil, in the form of its tetra (trimethyl silyl) deriv. with an alkyl bromide, such as propyl, butyl or isopropyl bromide, at 170 deg.C; (b) reaction of the prod. with ethyl ortho-formate in acetic anhydride at reflux temp.; and (c) evaporating to dryness and purifying the residual solid by crystallisation from alcohol.
ES542943A1985-05-081985-05-08
A PROCEDURE FOR THE PREPARATION OF 3-ALKYLXANTHINES
GrantedES542943A0
(en)
Stereoselective process for preparing beta-anomer enriched 2-deoxy-2, 2-difluoro-d-ribofuranosyl-3, 5-hydroxy protected-1-alkyl and aryl sulfonate intermediates.