CH642633A5 - Process for the preparation of dienones of the narwedine type and their derivatives - Google Patents
Process for the preparation of dienones of the narwedine type and their derivatives Download PDFInfo
- Publication number
- CH642633A5 CH642633A5 CH978179A CH978179A CH642633A5 CH 642633 A5 CH642633 A5 CH 642633A5 CH 978179 A CH978179 A CH 978179A CH 978179 A CH978179 A CH 978179A CH 642633 A5 CH642633 A5 CH 642633A5
- Authority
- CH
- Switzerland
- Prior art keywords
- derivatives
- dienones
- preparation
- alkyl group
- lower alkyl
- Prior art date
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D491/00—Heterocyclic compounds containing in the condensed ring system both one or more rings having oxygen atoms as the only ring hetero atoms and one or more rings having nitrogen atoms as the only ring hetero atoms, not provided for by groups C07D451/00 - C07D459/00, C07D463/00, C07D477/00 or C07D489/00
- C07D491/02—Heterocyclic compounds containing in the condensed ring system both one or more rings having oxygen atoms as the only ring hetero atoms and one or more rings having nitrogen atoms as the only ring hetero atoms, not provided for by groups C07D451/00 - C07D459/00, C07D463/00, C07D477/00 or C07D489/00 in which the condensed system contains two hetero rings
- C07D491/10—Spiro-condensed systems
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D223/00—Heterocyclic compounds containing seven-membered rings having one nitrogen atom as the only ring hetero atom
- C07D223/14—Heterocyclic compounds containing seven-membered rings having one nitrogen atom as the only ring hetero atom condensed with carbocyclic rings or ring systems
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B3/00—Electrolytic production of organic compounds
- C25B3/20—Processes
- C25B3/23—Oxidation
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)
- Nitrogen Condensed Heterocyclic Rings (AREA)
- Other In-Based Heterocyclic Compounds (AREA)
- Catalysts (AREA)
Description
Die Erfindung betrifft ein Verfahren zur Herstellung von Dienonen des Narwedin-Typs, die als Ausgangsprodukte zur Herstellung von Amaryllidaceae-Alkaloiden verwendet werden können. The invention relates to a process for the preparation of dienones of the Narwedin type which can be used as starting materials for the production of Amaryllidaceae alkaloids.
Die Herstellung von Dienonen des Narwedin-Typs auf chemischem Weg mittels einer Phenoloxydation entsprechender Diphenolderivate ist von der Literatur her bekannt, doch bei dieser Oxydationsweise werden ausser dem Endprodukt auch viele Nebenprodukte erhalten, deren Abtrennung schwierig ist und die auch nicht weiter verwendbar sind. The production of dienones of the narwedin type by chemical means by means of phenol oxidation of corresponding diphenol derivatives is known from the literature, but with this mode of oxidation, many by-products are obtained in addition to the end product, the separation of which is difficult and which cannot be used further.
Aufgabe der Erfindung ist, ein Verfahren zur Herstellung von Dienonen des Narwedin-Typs bereitzustellen, wobei die erhaltenen Verbindungen einen höheren Reinheitsgrad aufweisen und in grösserer Ausbeute erhalten werden. Die erhaltenen Verbindungen können in Amaryllidaceae-Alkaloide überführt werden. The object of the invention is to provide a process for the preparation of dienones of the Narwedin type, the compounds obtained having a higher degree of purity and being obtained in greater yield. The compounds obtained can be converted into amaryllidaceae alkaloids.
Die erfindungsgemäss herstellbaren Verbindungen weisen i die folgende Formel auf in der A The compounds which can be prepared according to the invention have the following formula in which A
NR, NO,
oder or
R,R_ R, R_
(I) (I)
bedeutet, R2 eine niedere Alkylgruppe, -CH2C6H5 oder 25 -CH2C6H4OCH3 ist, R3 Halogen bedeutet, R4 eine niedere Alkylgruppe ist, R5 eine anorganische oder organische Säure darstellt, vorzugsweise HC104 und X = H2 und Y = O oder X = O und Y = H2 oder X = H2 und Y = H2 sind. Das erfindungsgemässe Verfahren ist dadurch gekenn-30 zeichnet, dass man Diphenol-Derivate der Formel or. means R2 is a lower alkyl group, -CH2C6H5 or 25 -CH2C6H4OCH3, R3 means halogen, R4 is a lower alkyl group, R5 represents an inorganic or organic acid, preferably HC104 and X = H2 and Y = O or X = O and Y = Are H2 or X = H2 and Y = H2. The process according to the invention is characterized in that diphenol derivatives of the formula or.
35 35
40 40
worin Ri für eine niedere Alkylgruppe, -CH2C6H5 oder -CH2CcH4OCH3 steht und R2 sowie R3 wie oben definiert so sind, einer elektrochemischen Oxydation unterwirft. wherein Ri represents a lower alkyl group, -CH2C6H5 or -CH2CcH4OCH3 and R2 and R3 are as defined above, subjected to electrochemical oxidation.
Die elektrochemische Oxydation der Diphenol-Derivate wird gewöhnlich in einer Elektrolysezelle durchgeführt, deren Anodenraum vom Kathodenraum getrennt ist. Man arbeitet vorzugsweise in einem Medium eines organischen Lösemit-55 tels, z.B. Acetonitril und andere und in Gegenwart eines Leitelektrolyten (Leitsalz), wie z.B. LiC104, KC104, NaC104, (C4H9)4NBF4) oder (C2H5)4NBF4). Insbesondere beträgt das Arbeitspotential der Anode 1,1-1,7 V. Auf diese Weise können die Dienone des Narwedin-Typs und deren Derivate 60 bevorzugt hergestellt werden. Die Arbeitselektrode kann eine Platinelektrode, Graphitelektrode usw. sein, in welcher das Arbeitspotential gewöhnlich mit einer Vergleichselektrode bestimmt wird. Das Medium kann sauer, neutral oder alkalisch sein, wobei unterschiedliche Zusatzstoffe, we Na^jCOj, 65 K2COs, NaHCOs, HBF4 oder CH3COOH bevorzugt eingesetzt werden. The electrochemical oxidation of the diphenol derivatives is usually carried out in an electrolysis cell, the anode compartment of which is separated from the cathode compartment. It is preferred to work in an organic solvent medium, e.g. Acetonitrile and others and in the presence of a conductive electrolyte (conductive salt), e.g. LiC104, KC104, NaC104, (C4H9) 4NBF4) or (C2H5) 4NBF4). In particular, the working potential of the anode is 1.1-1.7 V. In this way, the Narwedin-type dienones and their derivatives 60 can preferably be produced. The working electrode can be a platinum electrode, graphite electrode, etc., in which the working potential is usually determined using a comparison electrode. The medium can be acidic, neutral or alkaline, with different additives, such as Na ^ jCOj, 65 K2COs, NaHCOs, HBF4 or CH3COOH being preferably used.
Die Vorteile des erfindungsgemässen Verfahrens beruhen darauf, dass das Endprodukt mit grosser Reinheit erhalten The advantages of the method according to the invention are based on the fact that the end product is obtained with great purity
3 3rd
642633 642633
wird. Das nicht umgesetzte Ausgangsprodukt kann aus der Reaktionsmischung sehr leicht abgetrennt werden, wonach man es wieder verwenden kann. becomes. The unreacted starting product can be very easily separated from the reaction mixture, after which it can be used again.
Die erfindungsgemässe Oxydation hat eine Ausbeute von 40%, bezogen auf das hergestellte Produkt. Das restliche, nicht umgesetzte Ausgangsprodukt kann erneut in den Reak-tionsprozess eingeführt werden, und auf soche Weise kann eine quantitative Umsetzung des Ausgangsproduktes in das Endprodukt erzielt werden. Durch die elektrochemische Oxydation ist die Ausbeute des Endproduktes auf diese Weise höher als in den bisher bekannten Verfahren für eine entsprechende chemische Oxydation. The oxidation according to the invention has a yield of 40%, based on the product produced. The remaining, unreacted starting product can be reintroduced into the reaction process, and in this way a quantitative conversion of the starting product into the end product can be achieved. As a result of the electrochemical oxidation, the yield of the end product is higher than in the previously known processes for a corresponding chemical oxidation.
Anhand der nachstehend angeführten Beispiele wird die Erfindung näher erläutert. The invention is explained in more detail with reference to the examples given below.
Beispiele 1 und 2 Examples 1 and 2
H3C0 H3C0
h3co h3co
H5C6H2CO H5C6H2CO
In den Anodenraum werden 0,001 Mol des Ausgangs--N-Methyl(4-methoxyphenethyl)-2-brom-4,5- dimethoxy-benzamid (1) in 1: 100 Lösemittel (Acetonitril) gegeben, das 2,4% Leitsalz (C4H9)4NBF4 und 2% NBF4 Säure (KC104 + K2C03) enthält. 0.001 mol of the starting - N-methyl (4-methoxyphenethyl) -2-bromo-4,5-dimethoxy-benzamide (1) in 1: 100 solvent (acetonitrile) containing 2.4% conductive salt ( C4H9) 4NBF4 and 2% NBF4 acid (KC104 + K2C03) contains.
Der Kathodenraum und die elektrochemische Brücke der Vergleichselektrode enthalten das Anodenlösemittel mit dem gleichen Prozent Leitsalz. Als Elektrode wird Platin benutzt, hingegen ist die Vergleichselektrode Ag/Ag+ in Acetonitril. Die Arbeitsspannung der Anode beträgt 1,3 V. Das Verfahren verläuft bei einer Temperatur von weniger als 0°C 3-5 Stunden lang, bis die äquivalente Strommenge durchläuft. The cathode compartment and the electrochemical bridge of the comparison electrode contain the anode solvent with the same percent conductive salt. Platinum is used as the electrode, while the comparison electrode is Ag / Ag + in acetonitrile. The working voltage of the anode is 1.3 V. The process runs at a temperature of less than 0 ° C for 3-5 hours until the equivalent amount of current passes.
0 0
Nach Beendigung der Reaktion wird die Lösung des Ano-55 denraums mittels Verdampfung fast getrocknet, man löst den erhaltenen Rest in Chloroform und dann wird mit einer Hydrogencarbonat-Lösung und Wasser gewaschen. Nach Trocknung der Lösungs wird das Lösemittel verdampft. Der Rest wird entweder chromatographisch oder durch Umkri-60 stallisierung gereinigt. After the reaction has ended, the solution in the anode compartment is almost dried by evaporation, the residue obtained is dissolved in chloroform and then washed with a hydrogen carbonate solution and water. After the solution has dried, the solvent is evaporated. The rest is purified either by chromatography or by recrystallization.
Die Ausbeute an 8-Brom-9-oxo-0,0-dimethyIhydroxy-apogallantamin beträgt bis zu 40%. The yield of 8-bromo-9-oxo-0,0-dimethylhydroxy-apogallantamine is up to 40%.
Bei der Oxydation von (4'-Benzyloxyphenethyl)-2-brom--4-methoxy-5-benzyloxybenzamid wird analog 8-Brom-9-oxo-65 -0,0-methylbenzylhydroxyapogallantamin mit einer ähnlicher Ausbeute erhalten. In the oxidation of (4'-benzyloxyphenethyl) -2-bromo-4-methoxy-5-benzyloxybenzamide, 8-bromo-9-oxo-65-0.0-methylbenzylhydroxyapogallantamine is obtained analogously with a similar yield.
och och
nch3 > h3co nch. nch3> h3co nch.
Claims (6)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BG7842315A BG28324A2 (en) | 1978-11-21 | 1978-11-21 | Method of obtaining of dienons navedine type and their derivatives |
Publications (1)
Publication Number | Publication Date |
---|---|
CH642633A5 true CH642633A5 (en) | 1984-04-30 |
Family
ID=3905594
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH978179A CH642633A5 (en) | 1978-11-21 | 1979-10-31 | Process for the preparation of dienones of the narwedine type and their derivatives |
Country Status (8)
Country | Link |
---|---|
JP (1) | JPS55105669A (en) |
BG (1) | BG28324A2 (en) |
CH (1) | CH642633A5 (en) |
DD (1) | DD160866A3 (en) |
DE (1) | DE2945162A1 (en) |
FR (1) | FR2442237A1 (en) |
IT (1) | IT1164750B (en) |
PL (1) | PL219581A1 (en) |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3950236A (en) * | 1974-07-24 | 1976-04-13 | The United States Of America As Represented By The Secretary Of Health, Education And Welfare | Production of angular alkylated polycyclides by electrochemical annelation |
-
1978
- 1978-11-21 BG BG7842315A patent/BG28324A2/en unknown
-
1979
- 1979-10-04 DD DD79216088A patent/DD160866A3/en not_active IP Right Cessation
- 1979-10-31 CH CH978179A patent/CH642633A5/en not_active IP Right Cessation
- 1979-11-07 IT IT50770/79A patent/IT1164750B/en active
- 1979-11-08 DE DE19792945162 patent/DE2945162A1/en not_active Withdrawn
- 1979-11-13 PL PL21958179A patent/PL219581A1/xx unknown
- 1979-11-16 FR FR7928373A patent/FR2442237A1/en active Granted
- 1979-11-21 JP JP15130079A patent/JPS55105669A/en active Pending
Also Published As
Publication number | Publication date |
---|---|
FR2442237B1 (en) | 1983-12-02 |
PL219581A1 (en) | 1980-07-28 |
JPS55105669A (en) | 1980-08-13 |
IT1164750B (en) | 1987-04-15 |
BG28324A2 (en) | 1980-04-15 |
DE2945162A1 (en) | 1980-06-04 |
FR2442237A1 (en) | 1980-06-20 |
IT7950770A0 (en) | 1979-11-07 |
DD160866A3 (en) | 1984-05-16 |
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