Process for the preparation of 1-oxa-3,8-diaza-4-oxospiro[4.5]de

Details Process for the preparation of 1-oxa-3,8-diaza-4-oxospiro[4.5]de Process for the preparation of 1-oxa-3,8-diaza-4-oxospiro[4.5]de

1994-11-02

1997-07-01

Trinh, Ba K.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D49810

Patent

active

056440600

ABSTRACT:
The invention relates to an environmentally friendly process for the preparation of compounds of the formula below ##STR1## in which R.sup.1 and R.sup.2 are preferably H or alkyl, R.sup.3 and R.sup.4 are preferably alkyl or cycloalkyl, R.sup.5 and R.sup.6 are preferably hydrogen or methyl and R.sup.7 is in particular alkyl. In the process, the additional use of a phase transfer catalyst can be dispensed with without loss in yield.

REFERENCES:
patent: 4110334 (1978-08-01), Mayer et al.
patent: 4408051 (1983-10-01), Hinsken et al.
patent: 4689416 (1987-08-01), Ertl et al.

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