SU455954A1 - Method for preparing 6-methoxy-7-hydroxycoumarins - Google Patents
Method for preparing 6-methoxy-7-hydroxycoumarinsInfo
- 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
- Authority
- SU
- USSR - Soviet Union
- Prior art keywords
- methoxy
- hydroxycoumarins
- preparing
- mol
- water
- Prior art date
Links
Description
1one
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.
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)
Publication Number | Publication Date |
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SU455954A1 true SU455954A1 (en) | 1975-01-05 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SU1791256A SU455954A1 (en) | 1972-05-30 | 1972-05-30 | Method for preparing 6-methoxy-7-hydroxycoumarins |
Country Status (1)
Country | Link |
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SU (1) | SU455954A1 (en) |
Cited By (1)
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 |
-
1972
- 1972-05-30 SU SU1791256A patent/SU455954A1/en active
Cited By (1)
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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