申请人:Lonza Ltd.
公开号:US04851540A1
公开(公告)日:1989-07-25
Process for the production of imidazole derivatives of the formula: ##STR1## wherein R.sub.1 is an (R)- or (S)-1-phenylalkyl group, an (R)- or (S)-1-alkoxycarbonyl-1-phenylmethyl group or an (R)- or (S)-1-aryloxycarbonyl-1-phenylmethyl group, R.sub.2 is hydrogen, a substituted or unsubstituted alkanoyl group, an unsubstituted or a substituted benzoyl group, a substituted or an unsubstituted benzyl group, an alkoxycarbonyl group, and aryloxycarbonyl group, an alkoxyalkyl group, a pyranyl group, a substituted or unsubstituted benzenesulfonyl group, an alkylsulfonyl group, a diarylphosphinyl group, a dialkoxyphosphinyl group or a trialkylsilyl group, and A is a sulfur or oxygen atom. A tetronic acid of the formula: ##STR2## wherein A has the above-mentioned meaning, is reacted with a diazonium salt, converting the resultant arylazotetronic acid or the tautomeric arylhydrazone in a further step with a chiral amine into an arylazoamino compound, reducing the arylazoamino compound, converting the resultant diamine, with phosgene or a phosgene-equivalent reagent, into the corresponding imidazole and optionally introducing a protective group by reaction with a substituted or unsubstituted aliphatic or aromatic acid chloride, an aliphatic or aromatic carboxylic acid anhydride, a haloformic acid alkyl ester, a 1-alkoxyalkyl halide, an enol ether, an aromatic or aliphatic sulfonic acid halide, a diarylphosphinic acid halide, a phosphoric acid dialkyl ester halide, a trialkyl silyl halide or a trialkyl silyl acetamide. These imidazole derivatives are suitable as intermediate products for the production of (+) biotin.
制备式为:##STR1##其中R.sub.1是(R)-或(S)-1-苯基烷基,(R)-或(S)-1-烷氧羰基-1-苯甲基,或(R)-或(S)-1-芳氧羰基-1-苯甲基,R.sub.2是氢,取代或未取代的烷酰基,未取代或取代的苯甲酰基,取代或未取代的苄基,烷氧羰基,芳氧羰基,烷氧基烷基,
吡喃基,取代或未取代的苯磺酰基,烷基磺酰基,二芳基膦基,二烷氧基膦基或三烷基
硅基,A是
硫或氧原子的
咪唑衍
生物的制备方法。式为:##STR2##其中A具有上述含义,与重氮盐反应,将所得的芳基偶氮四
酮酸或互变异构体芳基腙在进一步步骤中与手性胺反应成芳基偶氮
氨基化合物,还原芳基偶氮
氨基化合物,将所得的二胺与
光气或
光气等效试剂反应成相应的
咪唑,并通过与取代或未取代的脂肪族或芳香族酸
氯化物,脂肪族或芳香族
羧酸酐,卤代
甲酸烷基酯,1-烷氧基烷基卤化物,烯醚,芳香族或脂肪族
磺酸卤化物,二芳基
膦酸卤化物,
磷酸二烷基酯卤化物,三烷基
硅基卤化物或三烷基
硅基乙酰胺反应,可选地引入保护基。这些
咪唑衍
生物适用于生产(+)
生物素的中间产物。