CN1230541A - Preparation of N-formyl piperidine - Google Patents
Preparation of N-formyl piperidine Download PDFInfo
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- CN1230541A CN1230541A CN 98113881 CN98113881A CN1230541A CN 1230541 A CN1230541 A CN 1230541A CN 98113881 CN98113881 CN 98113881 CN 98113881 A CN98113881 A CN 98113881A CN 1230541 A CN1230541 A CN 1230541A
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- formyl piperidine
- piperidines
- reaction
- piperidine
- preparation
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- Hydrogenated Pyridines (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The present invention features that piperidine is made to react with ester of organic acid so as to eliminate corresponding alcohol and to obtain N-formyl piperidine, where R in HCOOR is C1-C4 fatty alkane, phenyl, benzyl or other aralkyl. The reaction temperature is 60-200 deg.c. The present invention has the advantages of simple raw material, high yield, stable product quality, easy post-separation, simple technological process, no corrosion, low equipment investment and easy operation.
Description
The invention provides the preparation method of a kind of N-formyl piperidine and homologue thereof.
N-formyl piperidine and homologue thereof are the fine solvent of multiple macromolecular material; it is having a lot of use aspect the processing of macromolecular material such as polyacrylonitrile, nylon and polysulfones etc. and the organic synthesis; at present, the method for preparing the N-formyl piperidine mainly can reduce following four kinds:
1. in the presence of catalyzer, piperidines and CO carry out carbonylation reaction, and this method needs to carry out under High Temperature High Pressure, and productive rate is about about 85%:
2. in the presence of phase-transfer catalyst, the reaction of piperidines and chloroform, its productive rate is 11～89%;
3. piperidines and dimethyl formamide etc. contain the acyl group permutoid reaction of acyl compounds, and this method need be used big excessive acyl compounds, and uses dense H
2SO
4Make catalyzer, cause problems such as reactant recovery and liquid waste disposal, and productive rate is the highest is about 87.5%;
4. the reaction of piperidines and formic acid, see Chinese patent 96115031.1, this method reaction conditions relaxes, productive rate is up to 99%, be a reasonable method, but wherein dehydrating step is comparatively difficult, needs higher temperature, perhaps need to use deleterious benzene or toluene to carry out azeotropic dehydration, and formic acid can have corrosion to equipment as entrainer.
The object of the present invention is to provide a kind of preparation method of N-formyl piperidine, its raw material is simple, the productive rate height, and constant product quality, postorder separates easily, and technology difficulty is low, does not have corrosion, and investment goods is few, easily operation.
The invention provides a kind of preparation method of N-formyl piperidine, it is characterized in that: slough corresponding alcohol with piperidines and organic acid acetic reaction and obtain the N-formyl piperidine; Wherein the R of organic acid acetic HCOOR is C
1～4The aliphatic chain alkyl, or aromatic hydrocarbyls such as phenyl, benzyl; Temperature of reaction is between 60～200 ℃.The present invention can be with common water distilling apparatus or rectifier unit, and direct heating steams alcohol.Force method of the present invention, reaction raw materials is simple, the reaction yield height approaches theoretical yield, does not have other by product except alcohol, the institute so that and product separation, this is a highly desirable method in a word.Below by embodiment in detail the present invention is described in detail.
Embodiment 1
In having 250 milliliters common matrass of feeding device, add 43 gram piperidines and 30 gram methyl-formiates; oil bath is heated to 80～150 ℃; get reaction product 57.4 grams after steaming methyl alcohol; stratographic analysis wherein N-formyl piperidine content is 97.52%, is that benchmark calculates with the piperidines, and its molar yield is 98%; underpressure distillation gets N-formyl piperidine 55.0 grams; stratographic analysis content is 99.9%, is that benchmark calculates with the piperidines, and molar yield is 96%.Gas chromatographic analysis is produced 103 gas chromatographs with Shanghai analytical instrument factory, chromatographic condition: PEG2 ten thousand packed columns, 2 meters of column lengths, 3 millimeters of internal diameters, 140 ℃ of column temperatures, 150 ℃ of flame ionization ditector temperature of vaporization chamber, carrier gas is a high pure nitrogen, and flow velocity is 15ml/min, hydrogen 80ml/min, air 200ml/min, quantitative with normalization method.
Embodiment 2
In having 250 milliliters matrass of feeding device, add 43 gram piperidines and 38 gram ethyl formates (content 98%); oil bath is heated to 80～180 ℃; get product 59 grams after sloughing ethanol; stratographic analysis wherein N-formyl piperidine content is 95.65%; with the piperidines is that benchmark calculates, and molar yield is 99%.
Comparative example 1
In having 250 milliliters of matrasss of feeding device, add 43 gram piperidines, 10 gram toluene and 26.5 gram (content 87.7%) formic acid; oil bath is heated to 100～200 ℃; azeotropic cools off after having taken off water; in matrass, obtain 66 gram products; use gas chromatographic analysis; the content of N-formyl piperidine wherein is 85.29%, is that benchmark calculates with the piperidines, and its molar yield is 98%.
Comparative example 2
Having reflux exchanger; add 47 gram piperidines in 500 milliliters of there-necked flasks of temperature gauge pipe and feeder; the 206 gram dimethyl formamides and the 27.5 gram vitriol oils; back flow reaction 6 hours; after reaction finishes; reaction product separating funnel layering; tell lower floor; with 20 milliliters of extracted with diethyl ether twice, the acid layer of containing after the extraction is by product sulfuric acid two (dimethylamine) salt, remaining combine 230 grams; use gas chromatographic analysis; N-formyl piperidine content is 23.9%, is that benchmark calculates with the piperidines, and its molar yield is 88%.
Claims (1)
1. the preparation method of a N-formyl piperidine is characterized in that: slough corresponding alcohol with piperidines and organic acid acetic reaction and obtain the N-formyl piperidine; Wherein the R of organic acid acetic HCOOR is C
1～4The aliphatic chain alkyl, or aromatic hydrocarbyls such as phenyl, benzyl; Temperature of reaction is between 60～200 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN98113881A CN1091104C (en) | 1998-04-02 | 1998-04-02 | Preparation of N-formyl piperidine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN98113881A CN1091104C (en) | 1998-04-02 | 1998-04-02 | Preparation of N-formyl piperidine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1230541A true CN1230541A (en) | 1999-10-06 |
| CN1091104C CN1091104C (en) | 2002-09-18 |
Family
ID=5223576
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN98113881A Expired - Fee Related CN1091104C (en) | 1998-04-02 | 1998-04-02 | Preparation of N-formyl piperidine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1091104C (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB8519707D0 (en) * | 1985-08-06 | 1985-09-11 | Fordonal Sa | Chemical compounds |
| CN1052228C (en) * | 1996-01-17 | 2000-05-10 | 中国科学院大连化学物理研究所 | Prepn. method for n-formyl piperidine and homologs thereof |
-
1998
- 1998-04-02 CN CN98113881A patent/CN1091104C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1091104C (en) | 2002-09-18 |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20020918 |