摘要:
A 1-bromoalkylbenzene derivative is prepared by reacting a phenylalkene derivative with hydrogen bromide in the presence of a non-polar solvent. The phenylalkene derivative is prepared by reacting an alkenyl halide with metal magnesium to form a Grignard reagent, and then reacting the Grignard reagent with a benzyl halide derivative. An allyl Grignard reagent is prepared by reacting continuously an allyl halide derivative with metal magnesium in an organic solvent, in which the allyl halide derivative and metal magnesium are continuously added to the reaction system and the allyl Grignard reagent formed is continuously removed from the reaction system. The processes provide the intended compounds in high yields, high selectivities and high purities.
摘要:
A 1-bromoalkylbenzene derivative is prepared by reacting a phenylalkene derivative with hydrogen bromide in the presence of a non-polar solvent. The phenylalkene derivative is prepared by reacting an alkenyl halide with metal magnesium to form a Grignard reagent, and then reacting the Grignard reagent with a benzyl halide derivative. An allyl Grignard reagent is prepared by reacting continuously an allyl halide derivative with metal magnesium in an organic solvent, in which the allyl halide derivative and metal magnesium are continuously added to the reaction system and the allyl Grignard reagent formed is continuously removed from the reaction system. The processes provide the intended compounds in high yields, high selectivities and high purities.
摘要:
There is disclosed a process of producing a 2-cyano-4-oxo-4H-benzopyran compound of the general formula (2): ##STR1## wherein R.sup.1 and R.sup.2 are independently hydrogen, halogen, hydroxy, C.sub.1 -C.sub.5 alkyl, C.sub.1 -C.sub.5 alkoxy, nitro or a group of the RCONH wherein R is C.sub.1 -C.sub.20 alkyl, phenyl, phenyl-substituted (C.sub.1 -C.sub.20) alkyl, phenyl (C.sub.1 -C.sub.20)alkoxyphenyl or (C.sub.1 -C.sub.20) alkoxyphenyl. This production process is characterized in that a carboxamide of the general formula (1): ##STR2## wherein R.sup.1 and R.sup.2 are each as defined above, is reacted with a dehydrating agent in the presence of a pyridine compound of the general formula (4): ##STR3## wherein A.sup.1 and A.sup.2 are independently hydrogen or C.sub.1 -C.sub.5 alkyl. If the final product cannot be obtained as crystals having good filtration properties by ordinary treatments, a novel technique as disclosed herein can provide such crystals by dissolving the reaction product in an organic solvent insoluble or slightly soluble in water; pouring the resultant solution into water; and removing the organic solvent by distillation with stirring to effect the crystallization of the final product.
摘要:
There are disclosed an industrially favorable process for producing a tetrazole compound of general formula (1): characterized in that a nitrile of general formula (2): R1CN (2) is reacted with hydrazine or a salt thereof in the presence of a catalyst, followed by reaction with a nitrous acid compound of general formula (3): ANO2 (3) or a nitrile of general formula (2) is reacted with hydrogen sulfide, followed by reaction with an alkyl halide of general formula (4): R4J (4) with hydrazine or a salt thereof, and then with a nitrous acid compound of general formula (3); and an intermediate of general formula (5): R1C(═R5)R6 (5) which is useful for the production of the tetrazole compound (in which R1 to R6, A and J in the above formulas are as defined in the specification).
摘要:
There are disclosed an industrially favorable process for producing a tetrazole compound of general formula (1): ##STR1## characterized in that a nitrile of general formula (2):R.sup.1 CN (2)is reacted with hydrazine or a salt thereof in the presence of a catalyst, followed by reaction with a nitrous acid compound of general formula (3):ANO.sub.2 (3)or a nitrile of general formula (2) is reacted with hydrogen sulfide, followed by reaction with an alkyl halide of general formula (4):R.sup.4 J (4)with hydrazine or a salt thereof, and then with a nitrous acid compound of general formula (3); and an intermediate of general formula (5):R.sup.1 C(=R.sup.5)R.sup.6 (5)which is useful for the production of the tetrazole compound (in which R.sup.1 to R.sup.6, A and J in the above formulas are as defined in the specification).
摘要:
There are disclosed an industrially favorable process for producing a tetrazole compound of general formula (1): characterized in that a nitrile of general formula (2): R1CN (2) is reacted with hydrazine or a salt thereof in the presence of a catalyst, followed by reaction with a nitrous acid compound of general formula (3): ANO2 (3) or a nitrile of general formula (2) is reacted with hydrogen sulfide, followed by reaction with an alkyl halide of general formula (4): R4J (4) with hydrazine or a salt thereof, and then with a nitrous acid compound of general formula (3); and an intermediate of general formula (5): R1C(═R5)R6 (5) which is useful for the production of the tetrazole compound (in which R1 to R6, A and J in the above formulas are as defined in the specification).
摘要:
There is disclosed a process for producing a 2-(tetrazol-5-yl)-4-oxo-4H-benzopyran of general formula (1): ##STR1## which comprises reacting a hydroxyacetophenone of general formula (2): ##STR2## with a tetrazole compound of general formula (3): ##STR3## in the presence of a base in a solvent composed mainly of at least one selected from hydrocarbons, halogenated hydrocarbons and alcohols, and then treating the reaction mixture under acidic conditions.
摘要:
There are disclosed are a diastereomer salt of formula (1): a process for producing the same, a process for producing optically active 3,3,3-trifluoro-2-hydroxy-2-methylpropionic acid of formula (2′): a novel optically active amine compound of formula (4): a novel optically active amine compound of formula (8): an imine compound of formula (7) or (11):
摘要:
There are disclosed are A diastereomer salt of formula (1): a process for producing the same, a process for producing optically active 3,3,3-trifluoro-2-hydroxy-2-methylpropionic acid of formula (2′): a novel optically active amine compound of formula (4): a novel optically active amine compound of formula (8): an imine compound of formula (7) or (11):