Preparation of 1-acetyl-4-piperidones

Details Preparation of 1-acetyl-4-piperidones Preparation of 1-acetyl-4-piperidones

1997-08-14

1999-01-19

Huang, Evelyn

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

546 16, C07D21144

Patent

active

058615130

ABSTRACT:
A process for preparing 1-acetyl-4-piperidones of the formula I ##STR1## where R.sup.1, R.sup.2, R.sup.3 and/or R.sup.4 are each a C.sub.1 - to C.sub.6 -alkyl group or R.sup.1 and R.sup.2 together or/and R.sup.3 and R.sup.4 together are an alicyclic hydrocarbon chain having from 2 to 5 carbons, comprises reacting a component comprising the corresponding nonacetylated 4-piperidone with ketene in the presence of a component comprising an acid catalyst at from 20.degree. C. to 120.degree. C.

REFERENCES:
patent: 3043862 (1962-07-01), Altenschoepfer
patent: 3860628 (1975-01-01), Shuman
patent: 3886117 (1975-05-01), Havinga
patent: 3886212 (1975-05-01), Kunstle
patent: 4562152 (1985-12-01), Kleemann
patent: 5344979 (1994-09-01), Zey

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