Process for preparing 4-piperidone spiroketal compounds

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

1979-12-28

1981-02-10

Jiles, Henry R.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D40504

Patent

active

042503124

ABSTRACT:
A 2,2,6,6-tetramethyl-4-piperidone spiroketal carbinol compound of Formula I ##STR1## in which R.sub.1 represents an alkyl group having from one to six carbon atoms, is prepared by heating a trimethylolalkane compound having the formula R.sub.1 --C(CH.sub.2 OH).sub.3 with a 2,2,6,6-tetramethyl-4-piperidone ketal compound of Formula II ##STR2## in which R.sub.2 represents an alkyl group having from one to twelve carbon atoms or an ether-interrupted alkyl group having from three to twelve carbon atoms and from one to two ether oxygen atoms, removing alcohol R.sub.2 OH, and recovering 2,2,6,6-tetramethyl-4-piperidone spiroketal carbinol compound of Formula I.

REFERENCES:
patent: 3899464 (1975-08-01), Murayama
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: 4116927 (1978-09-01), Minagawa et al.
patent: 4118369 (1978-10-01), Minagawa et al.
patent: 4136081 (1979-01-01), Minagawa et al.

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