SU455954A1 - Method for preparing 6-methoxy-7-hydroxycoumarins - Google Patents

Method for preparing 6-methoxy-7-hydroxycoumarins

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Publication number
SU455954A1
SU455954A1 SU1791256A SU1791256A SU455954A1 SU 455954 A1 SU455954 A1 SU 455954A1 SU 1791256 A SU1791256 A SU 1791256A SU 1791256 A SU1791256 A SU 1791256A SU 455954 A1 SU455954 A1 SU 455954A1
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SU
USSR - Soviet Union
Prior art keywords
methoxy
hydroxycoumarins
preparing
mol
water
Prior art date
Application number
SU1791256A
Other languages
Russian (ru)
Inventor
Зоя Дмитриевна Кирсанова
Владимир Алексеевич Загоревский
Дмитрий Александрович Зыков
Мира Михайловна Шестаева
Original Assignee
Научно-исследовательский институт фармакологии АМН СССР
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Priority to SU1791256A priority Critical patent/SU455954A1/en
Application granted granted Critical
Publication of SU455954A1 publication Critical patent/SU455954A1/en

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Description

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Изобретение относитс  к способу получени  6-метокси-7-оксикумаринов (скополетины), используемых в синтезе биологически активных веществ.This invention relates to a process for the preparation of 6-methoxy-7-hydroxycoumarins (scopoletines) used in the synthesis of biologically active substances.

Известен способ получени  6-метокси-7-оксикумаринов метилированием 6,7-диоксикумаринов диметилсульфатом в растворителе (вода ) в присутствии едкого «атра (3 моль) три охлаждении (0°С).A known method for producing 6-methoxy-7-hydroxycoumarins by methylation of 6.7-dioxycoumarins with dimethyl sulfate in a solvent (water) in the presence of caustic "atra (3 mol) is cooled three times (0 ° C).

Выход 24-42%.Yield 24-42%.

Цель изобретени  - повышение выхода целевого продукта - достигаетс  тем, что метилирова«ие провод т в смеси диметил - сульфоксид (ДМСО) - вода в соотношении 10:1 в присутствии 2,5 моль едкого натра при (-10) - 0°С.The purpose of the invention, an increase in the yield of the target product, is achieved by the fact that methylation is not carried out in a mixture of dimethyl - sulfoxide (DMSO) - water in a ratio of 10: 1 in the presence of 2.5 mol of sodium hydroxide at (-10) - 0 ° C.

Пример. Получение 6-метокси-7-оксикумарина (скополетин).Example. Getting 6-methoxy-7-hydroxycoumarin (scopoletin).

К суспензии 2,5 г (0,0625 моль) растертого в порошок едкого натра в 2 .мл воды прибавл ют раствор 4,45 г (0,025 моль) 6,7-диоксикумарина в 15 мл ДМСО, охлаждают до - 10°С, При встр хивании по приливают 4,7 г (0,0375 моль) диметилсульфата в 5 мл ДМСО, поддержива  .температуру не выше 0°С. Осадок, вьшадающий по мере добавлени  диметилсульфата, загустевает. Встр хивают реакционную смесь еще 20 мин, выдерживают 3 час при 3-5°С, подкисл ют 30 мл 1 н. сол ной кислоты до кислой реакции по колго и выдерживают 16 час ири 3- 5°С. Осадок отфильтровывают, промывают 15 мл воды, высушивают в вакууме над л тиокисью фосфора и получают 3,69 г вещества, т. пл. 201-203°С. После перекристаллизации из 37 мл н-бута«ола выдел ют 3,07 г (64%) целевого продукта, т. пл. 205-206°С.To a suspension of 2.5 g (0.0625 mol) of powdered sodium hydroxide in 2 ml of water was added a solution of 4.45 g (0.025 mol) of 6.7-dioxycoumarin in 15 ml of DMSO, cooled to - 10 ° С, While shaking, 4.7 g (0.0375 mol) of dimethyl sulfate is poured into 5 ml of DMSO, maintaining the temperature not higher than 0 ° C. The precipitate discharging as dimethyl sulfate is added thickens. Inject the reaction mixture for another 20 minutes, incubate for 3 hours at 3-5 ° C, acidify with 30 ml of 1N. hydrochloric acid until acidic, and incubated for 16 hours and 3-5 ° C. The precipitate is filtered off, washed with 15 ml of water, dried in vacuo over lithium phosphorus to obtain 3.69 g of substance, so pl. 201-203 ° C. After recrystallization from 37 ml of n-buta "ol, 3.07 g (64%) of the desired product was isolated, m.p. 205-206 ° C.

Аналогичным образом из 4-метил-6,7-диоксикумарина получают 4-метилскополетин, выход 61%, т. пл. 217-218°С (н-бутанол).Similarly, from 4-methyl-6,7-dioxycoumarin get 4-methylscopoletin, yield 61%, so pl. 217-218 ° C (n-butanol).

Предмет изобретени Subject invention

Способ получени  6-метокси-7-оксикумаринов метилированием 6,7-диоксикумаринов диметилсульфатом в растворителе в присутствии едкого натра при охлаждении, отличающийс  тем, что, с целью повышени  выхода целевого продукта, .метилирование провод т в смеси диметилсульфоксид - вода в соотношении 10:1 в. присутствии 2,5 моль едкого натра при (10) -0°С.The method of producing 6-methoxy-7-hydroxycoumarins by methylation of 6,7-dioxycoumarins with dimethyl sulfate in a solvent in the presence of sodium hydroxide under cooling, characterized in that, in order to increase the yield of the target product, the methylation is carried out in a mixture of dimethyl sulfoxide - water in a ratio of 10: 1 c. the presence of 2.5 mol of sodium hydroxide at (10) -0 ° C.

SU1791256A 1972-05-30 1972-05-30 Method for preparing 6-methoxy-7-hydroxycoumarins SU455954A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SU1791256A SU455954A1 (en) 1972-05-30 1972-05-30 Method for preparing 6-methoxy-7-hydroxycoumarins

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SU1791256A SU455954A1 (en) 1972-05-30 1972-05-30 Method for preparing 6-methoxy-7-hydroxycoumarins

Publications (1)

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SU455954A1 true SU455954A1 (en) 1975-01-05

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5247099A (en) * 1989-08-17 1993-09-21 Abbott Laboratories Process for synthesis of 7-hydroxy coumarins having substitutions in the 4-position

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5247099A (en) * 1989-08-17 1993-09-21 Abbott Laboratories Process for synthesis of 7-hydroxy coumarins having substitutions in the 4-position

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