摘要:
Optically active (R)-1-(4-trifluoromethylphenyl)ethylamine is a novel compound as an important intermediate for medicines and agricultural chemicals. This compound can be obtained with high optical purity and high yield by a process including the steps of (a) a dehydrocondensation of 4′-(trifluoromethyl)acetophenone and an optically active (R)-1-phenylethylamine to obtain an optically active imine; (b) asymmetrically reducing the imine into an optically active secondary amine; (c) reacting the amine with an organic acid (phthalic acid or benzenesulfonic acid), thereby obtaining a product that is a phthalate of or benzenesulfonate of the amine; (d) subjecting the product of the step (c) to a hydrogenolysis, thereby obtaining a product that is a phthalate of or benzenesuilfonate of optically active (R)-1-(4-trifluoromethylphenyl)ethylamine; and (e) neutralizing the product of the step (d) into the optically active (R)-1-(4-trifluoromethylphenyl)ethylamine.
摘要:
The present invention relates to a method of producing an optically active 1-aryl-2-fluoro-substituted ethylamine compound of the formula [2] or a salt thereof by hydrogenolysis of an optically active secondary amine compound of the formula [1] or a salt thereof in the presence of a transition metal catalyst of Group VIII [Chem. 59] [where Ar represents an aryl group; n represents an integer of 1 or 2; and * represents an asymmetric carbon] [Chem. 60] [where Ar represents an aryl group; n represents an integer of 1 or 2; and * represents an asymmetric carbon].
摘要:
The present invention relates to a process for producing an optically active 1-alkyl-substituted 2,2,2-trifluoroethylamine, which is an important intermediate of medicines and agricultural chemicals, and which is represented by the formula [3] [in the formula R represents a lower alkyl group of a carbon and * represents an asymmetric carbon], or its salt by subjecting an optically active imine represented by the formula [1] to an asymmetric reduction under hydrogen atmosphere using a metal catalyst of Group VIII to convert it into an optically active secondary amine represented by the formula [2] and then by subjecting the secondary amine or its salt to hydrogenolysis.[Chem. 23]
摘要:
1-β-D-Arabinofuranosyluracil in 3′,5′-hydroxyl-protected form is reacted with a trifluoromethanesulfonylating agent in the presence of an organic base to convert it into a 2′-triflate form, and then it is reacted with a fluorinating agent containing “a salt or complex formed by an organic base and hydrofluoric acid” to produce 2′-deoxy-2′-fluorouridine in 3′,5′-hydroxyl-protected form. A deprotecting agent is further caused to act thereon to obtain 2′-deoxy-2′-fluorouridine. The 2′-deoxy-2′-fluorouridine obtained can efficiently be purified by temporarily converting it into a 3′,5′-diacetyl form, recrystallizing the 3′,5′-diacetyl form, and then deacetylating it. Thus, high-purity 2′-deoxy-2′-fluorouridine can be produced.
摘要:
An optically active 1-(fluoro-, trifluoromethyl- or trifluoromethoxy-substituted phenyl)alkylamine N-monoalkyl derivative represented by the formula 4 is produced by a process including (a) reacting an optically active secondary amine, represented by the formula 1, with an alkylation agent R2—X, in the presence of a base, thereby converting the secondary amine into an optically active tertiary amine represented by the formula 3; and (b) subjecting the tertiary amine to a hydrogenolysis, thereby producing the N-monoalkyl derivative, wherein R represents a fluorine atom, trifluoromethyl group or trifluoromethoxy group, n represents an integer of from 1 to 5, each of R1 and R2 independently represents an alkyl group having a carbon atom number of from 1 to 6, Me represents a methyl group, Ar represents a phenyl group or 1- or 2-naphthyl group, * represents a chiral carbon, and X represents a leaving group.
摘要:
1-β-D-Arabinofuranosyluracil in 3′,5′-hydroxyl-protected form is reacted with a trifluoromethanesulfonylating agent in the presence of an organic base to convert it into a 2′-triflate form, and then it is reacted with a fluorinating agent containing “a salt or complex formed by an organic base and hydrofluoric acid” to produce 2′-deoxy-2′-fluorouridine in 3′,5′-hydroxyl-protected form. A deprotecting agent is further caused to act thereon to obtain 2′-deoxy-2′-fluorouridine. The 2′-deoxy-2′-fluorouridine obtained can efficiently be purified by temporarily converting it into a 3′,5′-diacetyl form, recrystallizing the 3′,5′-diacetyl form, and then deacetylating it. Thus, high-purity 2′-deoxy-2′-fluorouridine can be produced.
摘要:
A process for producing a brominated acetal (represented by the formula 3) includes (a) brominating a trifluoromethyl-substituted acetophenone by Br2 in the presence of an alkylene diol. It is optional to produce a trifluoromethyl-substituted 2-alkoxyacetophenone derivative (represented by the formula 9) by (b) reacting the brominated acetal with a metal alkoxide, thereby converting the brominated acetal into an ether; and (c) hydrolyzing the ether in the presence of an acid catalyst to remove an acetal group from the ether, thereby producing the 2-alkoxyacetophenone derivative. Alternatively, the 2-alkoxyacetophenone can be produced by (a) reacting a trifluoromethyl-substituted phenacyl halide with an acetalization agent, thereby converting the phenacyl halide into an acetal; (b) reacting the acetal with a metal alkoxide, thereby converting the acetal into an ether; and (c) hydrolyzing the ether in the presence of an acid catalyst to remove the acetal group from the ether.
摘要翻译:制备溴化缩醛的方法(由式3表示)包括(a)在亚烷基二醇的存在下用Br 2 H 3溴化三氟甲基取代的苯乙酮。 (b)使溴化缩醛与金属醇盐反应,从而将溴化缩醛转化成醚,任选地制备三氟甲基取代的2-烷氧基苯乙酮衍生物(由式9表示) 和(c)在酸催化剂的存在下水解醚,以从乙醚中除去缩醛基,从而制备2-烷氧基苯乙酮衍生物。 或者,2-烷氧基苯乙酮可以通过以下方法制备:(a)使三氟甲基取代的苯甲酰甲基卤化物与缩醛化剂反应,从而将苯甲酰甲酰卤转化成缩醛; (b)使缩醛与金属醇盐反应,从而将缩醛转化成醚; 和(c)在酸催化剂存在下水解该醚,以从乙醚中除去缩醛基。
摘要:
A process for producing a brominated acetal (represented by the formula 3) includes (a) brominating a trifluoromethyl-substituted acetophenone by Br2 in the presence of an alkylene diol. It is optional to produce a trifluoromethyl-substituted 2-alkoxyacetophenone derivative (represented by the formula 9) by (b) reacting the brominated acetal with a metal alkoxide, thereby converting the brominated acetal into an ether; and (c) hydrolyzing the ether in the presence of an acid catalyst to remove an acetal group from the ether, thereby producing the 2-alkoxyacetophenone derivative. Alternatively, the 2-alkoxyacetophenone can be produced by (a) reacting a trifluoromethyl-substituted phenacyl halide with an acetalization agent, thereby converting the phenacyl halide into an acetal; (b) reacting the acetal with a metal alkoxide, thereby converting the acetal into an ether; and (c) hydrolyzing the ether in the presence of an acid catalyst to remove the acetal group from the ether.
摘要翻译:制备溴化缩醛的方法(由式3表示)包括(a)在亚烷基二醇的存在下用Br 2 H 3溴化三氟甲基取代的苯乙酮。 (b)使溴化缩醛与金属醇盐反应,从而将溴化缩醛转化成醚,任选地制备三氟甲基取代的2-烷氧基苯乙酮衍生物(由式9表示) 和(c)在酸催化剂的存在下水解醚,以从乙醚中除去缩醛基,从而制备2-烷氧基苯乙酮衍生物。 或者,2-烷氧基苯乙酮可以通过以下方法制备:(a)使三氟甲基取代的苯甲酰甲基卤化物与缩醛化剂反应,从而将苯甲酰甲酰卤转化成缩醛; (b)使缩醛与金属醇盐反应,从而将缩醛转化成醚; 和(c)在酸催化剂存在下水解该醚,以从乙醚中除去缩醛基。
摘要:
An optically active 1-(fluoro-, trifluoromethyl- or trifluoromethoxy-substituted phenyl)alkylamine N-monoalkyl derivative represented by the formula 4 is produced by a process including (a) reacting an optically active secondary amine, represented by the formula 1, with an alkylation agent R2—X, in the presence of a base, thereby converting the secondary amine into an optically active tertiary amine represented by the formula 3; and (b) subjecting the tertiary amine to a hydrogenolysis, thereby producing the N-monoalkyl derivative, wherein R represents a fluorine atom, trifluoromethyl group or trifluoromethoxy group, n represents an integer of from 1 to 5, each of R1 and R2 independently represents an alkyl group having a carbon atom number of from 1 to 6, Me represents a methyl group, Ar represents a phenyl group or 1- or 2-naphthyl group, * represents a chiral carbon, and X represents a leaving group.
摘要:
The present invention relates to a process for producing an optically active 1-alkyl-substituted 2,2,2-trifluoroethylamine, which is an important intermediate of medicines and agricultural chemicals, and which is represented by the formula [3] [in the formula R represents a lower alkyl group of a carbon and * represents an asymmetric carbon], or its salt by subjecting an optically active imine represented by the formula [1] to an asymmetric reduction under hydrogen atmosphere using a metal catalyst of Group VIII to convert it into an optically active secondary amine represented by the formula [2] and then by subjecting the secondary amine or its salt to hydrogenolysis. [Chem. 23]