Process for preparing 4-piperidone spiroketal compounds

Details Process for preparing 4-piperidone spiroketal compounds Process for preparing 4-piperidone spiroketal compounds

1980-02-01

1981-02-10

Rotman, Alan L.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D40504

Patent

active

042503132

ABSTRACT:
2,2,6,6-Tetramethyl-4-piperidone spiroketal carbinol compound of Formula I ##STR1## in which R.sub.1 represents hydrogen, alkyl of one to ten carbon atoms, or aralkyl of seven to ten carbon atoms, and R.sub.2 represents alkyl of one of one to six carbon atoms, is prepared by heating a mixture of a 2,2,6,6-tetramethyl-4-piperidone compound of Formula II ##STR2## or an acid addition salt thereof, and a 1,3 dioxane compound having the formula III ##STR3## in which R.sub.3 and R.sub.4 represent R.sub.1 or aryl of six to ten carbon atoms or taken together represent alkylene of four to eight carbon atoms, removing R.sub.3 R.sub.4 CO compound and recovering 2,2,6,6-tetramethyl-4-piperidonespiroketal compound.

REFERENCES:
patent: 3899464 (1975-08-01), Murayama et al.
patent: 4096114 (1978-06-01), Minagawa et al.
patent: 4105625 (1978-08-01), Minagawa et al.
patent: 4115476 (1978-09-01), Minagawa et al.
patent: 4136081 (1979-01-01), Minagawa et al.

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