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-芳基氧羰基-1-苯甲基,R.sub.2是氢、取代或未取代的烷酰基、取代或未取代的苯甲酰基、取代或未取代的苯甲基、烷氧羰基、芳基氧羰基、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。式中的A具有上述含义,反应一种式为:##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、烯醇醚、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引入保护基。这些咪唑衍生物适用于生产(+)生物素的中间产品。