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的色酮的方法:##STR1##(其中R.sup.1和R.sup.2是氢、可选用卤代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基团的基团;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),其中包括以下步骤:(a) 对于制备R.sup.5和R.sup.6代表不同基团的化合物,将通式I的化合物##STR2##与通式R.sup.5--X的反应物反应,其摩尔量大致相等,优选为通式I的化合物的0.8-1.5摩尔量(其中R.sup.5具有上述相同的含义,X为卤素),然后将通式III的O-单取代化合物##STR3##(其中R.sup.1-R.sup.6和n如上所述)与通式III的化合物反应,其摩尔量为1.1-1.5(其中R.sup.6和X如上所述); 或(b) 对于制备R.sup.5和R.sup.6代表相同基团的化合物,将通式I的色酮(其中R.sup.1-R.sup.4和m的含义如上)与通式R.sup.5--X的化合物反应,其摩尔量为通式I的化合物的2-3倍(其中R.sup.5和X如上所述),优选在碱、催化剂和溶剂的存在下进行,然后在酸性水介质中还原通式III的O取代色酮衍生物(其中R.sup.1-R.sup.6和n如上所述),并脱水通式IV的色酚衍生物##STR4##(其中R.sup.1-R.sup.6和n如上所述)。通式V的化合物部分是新的,对于制备杀虫剂有用。