Abstract:
PROBLEM TO BE SOLVED: To provide a method of oxidizing β-isophorone using a manganese- salen complex, in high efficiency, also in high yield, selectivity and space time yield each convertible to large industrial scale even in case of high starting material concentration. SOLUTION: This method comprises oxidizing 3,5,5-trimethylcyclohex-3-en-1- one with molecular oxygen in the presence of a base, a solvent and a catalyst to produce the objective 3,5,5-trimethylcyclohex-2-ene-1,4-dione; wherein a manganese-salen complex of the formula [R is hydrogen or Cl; M is Mn(II) or Mn(III)(+)Cl(-)] is used as the catalyst.
Abstract:
PROBLEM TO BE SOLVED: To provide a new method for partial reduction of an alkyne compound while avoiding disadvantageous points of the conventional techniques. SOLUTION: This method for producing a cyclohexene derivative represented by general formula I or II [R1 is a group of formula V, a group of formula VI, a group of formula VII or a group of formula VII; R2 is OH or a protective group convertible to OH by hydrolysis; R3 and R4 are each hydrogen or a 1-4C alkyl; R5 is hydrogen or a 1-4C acyl] comprises reducing an alkyne compound represented by general formula III or IV [R1 and R2 are each as defined above]. The reducing agent used is a mixture of zinc and at least one or more compounds B selected from the group consisting of an ammonium salt, a copper salt, an alkali metal salt and an alkaline earth metal salt.
Abstract:
PROBLEM TO BE SOLVED: To provide a method for partially reducing an alkynic compound by which disadvantages of prior art are overcome. SOLUTION: This method is to produce a cyclohexene derivative represented by general formula I or II [wherein, R is selected from the following groups (wherein R and R are each hydrogen or a 1-4C alkyl; and R is hydrogen or a 1-4C acyl); R is OH or a protecting group convertible into hydroxyl group by hydrolysis]. The method includes reduction of the alkynic compound represented by general formula III or IV (wherein, R and R are each as defined in general formula I or II). In the method at least one salt of hyposulfurous acid or a salt of hydroxymethanesulfinic acid or a mixture of at least the one salt of hyposulfurous acid with at least the one salt of the hydroxymethanesulfinic acid is used.
Abstract translation:要解决的问题:提供一种部分还原炔烃化合物的方法,通过这种方法克服了现有技术的缺点。 解决方案:该方法是制备由通式I或II表示的环己烯衍生物[其中,R 1选自下列基团(其中R 3和R 4各自为氢或1-4C烷基 ; R 5为氢或1-4C酰基); R 2是OH或通过水解可转化为羟基的保护基]。 该方法包括还原由通式III或IV表示的炔化合物(其中R 1和R 2各自如通式I或II)所定义。 在该方法中,使用至少一种次亚硫酸的盐或羟基甲烷亚磺酸的盐或至少一种次亚硫酸的一种盐与至少一种羟基甲烷亚磺酸的盐的混合物。
Abstract:
PROBLEM TO BE SOLVED: To obtain the subject compound by a method providing excellent yield, selectivity and space time yield by oxidizing a specific compound with molecular oxygen in a solvent in the presence of a base, a specific catalyst and a specific additive. SOLUTION: This compound is obtained by oxidizing (A) 3,5,5-trimethyl- cyclohex-3-ene-1-one with (B) molecular oxygen in the presence of (C) a base, (D) a catalyst of the formula R1 to R8 are each H, a halogen, NO2, COR9, SO3R9 (R9 is H or a 1-4C alkyl), or the like; M is Mn (II), Mn (III)(+)X(-) [X(-) is a counterion with a negative charge in the case of a metal used in an oxidation stage III], Co (II), or the like} and (E) an additive comprising an acetate of the formula (R10R11R12C-COO(-))mY(m+) (R10 to R12 are each H, F, a 1-4C alkyl, or the like; Y is NH4+ or a metal cation of the main groups 1-4 with 1-4 valence (s); (m) is 1-4) (e.g. lithium acetate) in (F) a solvent (e.g. dimethylformamide).
Abstract:
The invention relates to a method for producing cyclohexenone derivatives of general formula (I), wherein R 1 represents hydrogen or OH; R 2 represents (Ia), comprising the following steps: (a) hydrolyzing a cyclohexenol compound of formula (II), wherein R 3 represents hydrogen and R 4 represents C 1 -C 6 -alkoxy or R 3 and R 4 represent vicinal hydroxy groups, which carry a common acetal protective group or a ketone protective group, R 5 represents (IIa), and R 6 represents a protected hydroxy group, in the absence of an organic solvent and in the presence of an acid catalyst; and; (b) extracting the reaction mixture by using a polar extracting agent.
Abstract:
The present invention relates to a method for preparing cyclohexene derivatives of the general formulae I or II by reducing alkyne compounds of the general formulae III or IV with a mixture of zinc and at least one ammonium salt of the formula V as reducing agent, in which the substituents R 1 to R 8 have independently of one another the meaning specified in the description, wherein the reducing agent comprises from 0.3 to 0.49 mol of at least one ammonium salt of the formula V per mol of zinc.
Abstract:
Production of 5-hydroxy-3-methyl-penta-1E,3E-dienyl- or 3-hydroxy-3-methyl-penta-1E,4-dienyl-cyclohexenone derivatives (I) or (II) by catalytic hydrogenation of 5-hydroxy-3-methyl-pent-3E-en-1-ynyl- or 3-hydroxy-3-methyl-pent-4-en-1-ynyl-cyclohexenone derivatives (III) or (IV) is carried out in presence of a catalyst containing iron. Production of alkadienyl-cyclohexenone derivatives of formula (I) or (II) by catalytic hydrogenation of alkenynyl-cyclohexenone derivatives of formula (III) or (IV) is carried out in presence of a catalyst containing iron. [Image] R1>4-(hydroxy or 1-4C acyloxy)-3-oxo-2,6,6-trimethyl-cyclohex-1-enyl, 1-hydroxy-4-oxo-2,6,6-trimethyl-cyclohex-2-en-1-yl, 3-oxo-2,6,6-trimethyl-cyclohex-1-enyl or a bicyclic group of formula (a); R2>OH or protecting group converted into OH by hydrolysis; R3>, R4>H or 1-4C alkyl. [Image].
Abstract:
The preparation of 3,5,5-trimethyl-cyclohex-2-ene-1,4-dione (I) by oxidation of 3,5,5-trimethyl-cyclohex-3-en-1-one (II) with molecular oxygen is catalyzed by a manganese salen complex (III). Preparation of 3,5,5-trimethyl-cyclohex-2-ene-1,4-dione (I) (i.e. oxoisophorone) involves oxidation of 3,5,5-trimethyl-cyclohex-3-en-1-one (II) (i.e. beta -isophorone) with molecular oxygen in presence of a solvent, a base and a manganese salen complex of formula (III) as catalyst. R = H or Cl; M = Mn(II) or Mn(III) .Cl .