SU456521A1 - Method of preparing 5-amino-benzodioxane-1,4 - Google Patents

Method of preparing 5-amino-benzodioxane-1,4

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Publication number
SU456521A1
SU456521A1 SU7201838850A SU1838850A SU456521A1 SU 456521 A1 SU456521 A1 SU 456521A1 SU 7201838850 A SU7201838850 A SU 7201838850A SU 1838850 A SU1838850 A SU 1838850A SU 456521 A1 SU456521 A1 SU 456521A1
Authority
SU
USSR - Soviet Union
Prior art keywords
amino
benzodioxane
preparing
benzene
ethanol
Prior art date
Application number
SU7201838850A
Other languages
Russian (ru)
Inventor
В.К. Даукшас
Р.С. Мартинкус
Э.Б. Удренайте
Л.В. Римкунайте
Original Assignee
Вильнюсский Ордена Трудового Красного Знамени Государственный Университет Им.В.Капускаса
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Вильнюсский Ордена Трудового Красного Знамени Государственный Университет Им.В.Капускаса filed Critical Вильнюсский Ордена Трудового Красного Знамени Государственный Университет Им.В.Капускаса
Priority to SU7201838850A priority Critical patent/SU456521A1/en
Application granted granted Critical
Publication of SU456521A1 publication Critical patent/SU456521A1/en

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  • Heterocyclic Carbon Compounds Containing A Hetero Ring Having Nitrogen And Oxygen As The Only Ring Hetero Atoms (AREA)

Description

в воде, мало растворимое в холодном спирте или эфире/ лучше в бензоле.in water, slightly soluble in cold alcohol or ether / better in benzene.

Б. 5-Амино6ензодиоксан-1,4-.B. 5-amino 6-benzodioxan-1,4-.

6 г 5-нитробензодиоксана-1,4 раствор ют в 70 мл нагретого до 80%-го этанола, прибавл ют.10 г железа в порошке и 0,5 г медной стружки (катализатор), перемешивают при еще 15 мин, в течение которых прибавл ют по капл м 1,5 мл концентрированной сол ной кислоты. Затем реакционную смесь кип т т и перемешивают Д ч, гор чий раствор фильтруют, филь. .трат охлаждают до 20 С,подкисл ют сол ной кислотой (индикатор конго) отгон ют этанол, остаток подщелачивают концентрированным раствором едкого натра, экстрагируют бензолом, перзгонкой бензольного экстракта вьщел ют 3,8 г (75%) продукта; т.кип. l28130°С (5 мм рт.ст); 1,6 g of 5-nitrobenzodioxane-1,4 are dissolved in 70 ml of heated to 80% ethanol, 10 g of iron in the powder and 0.5 g of copper chips (catalyst) are added, stirred for another 15 minutes, during which 1.5 ml of concentrated hydrochloric acid is added dropwise. Then the reaction mixture is boiled and stirred for D h, the hot solution is filtered, filter. The mixture is cooled to 20 ° C, acidified with hydrochloric acid (Congo indicator), ethanol is distilled off, the residue is made alkaline with concentrated sodium hydroxide solution, extracted with benzene, 3.8 g (75%) of the product is extracted with percolation of the benzene extract; bp l28130 ° C (5 mm Hg); one,

212,279 нм, 4,60; 2,92 (в этаноле ) .212.279 nm, 4.60; 2.92 (in ethanol).

Продукт представл ет собой густое 5 бесцветное масло, желтеющее на воздухе , нерастворимое в воде, растворимое в спирте, эфире и бензоле.The product is a thick, 5 colorless oil yellowing in air, insoluble in water, soluble in alcohol, ether and benzene.

формула изобретени invention formula

Способ получени  5-аминобензодиоксана-1 ,4, о тличающийс  тем, что, с целью повышени  продукта, 3-нитропирокатехин подвергают взаимодействию с 1,2-дибромэтаном в присутствии карбоната натри  в органическом растворителе с последующим восстановлением образующегос  при этом 5-нитрсбензодиоксана железом-в спиртовом растворе сол ной кислоты.The method of obtaining 5-aminobenzodioxan-1, 4, which is characterized by the fact that, in order to increase the product, 3-nitropyrocatechin is reacted with 1,2-dibromoethane in the presence of sodium carbonate in an organic solvent, followed by reduction of the 5-nitroxybenzodioxane formed by iron to in an alcoholic solution of hydrochloric acid.

SU7201838850A 1972-10-20 1972-10-20 Method of preparing 5-amino-benzodioxane-1,4 SU456521A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SU7201838850A SU456521A1 (en) 1972-10-20 1972-10-20 Method of preparing 5-amino-benzodioxane-1,4

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SU7201838850A SU456521A1 (en) 1972-10-20 1972-10-20 Method of preparing 5-amino-benzodioxane-1,4

Publications (1)

Publication Number Publication Date
SU456521A1 true SU456521A1 (en) 1978-01-05

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ID=20529995

Family Applications (1)

Application Number Title Priority Date Filing Date
SU7201838850A SU456521A1 (en) 1972-10-20 1972-10-20 Method of preparing 5-amino-benzodioxane-1,4

Country Status (1)

Country Link
SU (1) SU456521A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100422169C (en) * 2006-11-20 2008-10-01 烟台万润精细化工股份有限公司 Preparation method of 1, 4-benzodioxan-5-amine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100422169C (en) * 2006-11-20 2008-10-01 烟台万润精细化工股份有限公司 Preparation method of 1, 4-benzodioxan-5-amine

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