申请人:Alkaloida Vegyeszeti Gyar
公开号:US04866089A1
公开(公告)日:1989-09-12
The invention relates to a process for the preparation of chromenes of the general Formula V ##STR1## (wherein R.sup.1 and R.sup.2 are hydrogen, optionally halogeno substituted C.sub.1-6 alkyl or aryl; R.sup.3 and R.sup.7 stand for hydrogen, halogen or C.sub.1-6 alkyl; R.sup.4 represents C.sub.1-8 alkyl, aryl, aralkyl or a group containing a carbonyl group; R.sup.5 and R.sup.6 stand for C.sub.1-10 alkyl, aryl, amino, hydroxyalkyl, alkoxyalkenyl, alkylmercaptoalkyl, acyl, carboxy or an ester group or a halogen atom; n is 0 or 1) which comprises (a) for the preparation of compounds, in which R.sup.5 and R.sup.6 stand for different groups, reacting a compound of the general Formula I ##STR2## with an approximately equimolar, preferably 0.8-1.5 molar amount of a reactant of the general Formula R.sup.5 --X-related to the amount of the compound of the general Formula I (wherein R.sup.5 has the same meaning as stated above X is halogen) and reacting the O-monosubstituted compound of the general Formula III ##STR3## (wherein R.sup.1 -R.sup.6 and n are as stated above) obtained with a 1.1-1.5 molar amount of a compound of the general Formula III (wherein R.sup.6 and X are as stated above); or (b) for the preparation of compounds, in which R.sup.5 and R.sup.6 stand for the same group, reacting a chromanone of the general Formula I (wherein R.sup.1 -R.sup.4 and m have the meaning as stated above) with a 2-3 molar amount of a compound of the general Formula R.sup.5 --X-related to the amount of the compound of the general Formula I (wherein R.sup.5 and X are as stated above), preferably in the presence of a base, a catalyst and a solvent, and thereafter reducing the O-substituted chromanone derivative of the general Formula III thus obtained (wherein R.sup.1 -R.sup.6 and n are as stated above) and dehydrating the chromanol derivative of the general Formula IV ##STR4## thus obtained (wherein R.sup.1 -R.sup.6 and n are as stated above) in acidic-aqueous medium. The compounds of the general Formula V are partly new and useful for the preparation of pesticides.
本发明涉及一种制备通式 V 的咔咯烯的方法 ##STR1##(其中 R.sup.1 和 R.sup.2 为氢,或者选择性地取代为卤代的 C.sub.1-6 烷基或芳基;R.sup.3 和 R.sup.7 代表氢,卤素或 C.sub.1-6 烷基;R.sup.4 代表 C.sub.1-8 烷基,芳基,芳基烷基或含有羰基的基团;R.sup.5 和 R.sup.6 代表 C.sub.1-10 烷基,芳基,氨基,羟基烷基,烷氧基烯基,烷基硫醇烷基,酰基,羧基或酯基或卤素原子;n 为 0 或 1),其包括 (a) 用于制备化合物,其中 R.sup.5 和 R.sup.6 代表不同基团,将通式 I 的化合物 ##STR2## 与大约等摩尔量,优选为 0.8-1.5 摩尔量的通式 R.sup.5 --X 的反应物反应,与通式 III 的 O-单取代化合物 ##STR3##(其中 R.sup.1 -R.sup.6 和 n 如上所述)得到的化合物反应,该化合物与通式 III 的化合物的 1.1-1.5 摩尔量反应(其中 R.sup.6 和 X 如上所述);或 (b) 用于制备化合物,其中 R.sup.5 和 R.sup.6 代表相同基团,将通式 I 的咔咯酮(其中 R.sup.1 -R.sup.4 和 m 如上所述)与大约 2-3 摩尔量的通式 R.sup.5 --X 的化合物反应,优选在碱,催化剂和溶剂的存在下,并且随后还原所得的 O-取代咔咯酮衍生物 ##STR3##(其中 R.sup.1 -R.sup.6 和 n 如上所述)并脱水所得的咔咯酚衍生物 ##STR4##(其中 R.sup.1 -R.sup.6 和 n 如上所述)在酸性水性介质中。通式 V 的化合物部分为新化合物,对制备农药有用。