# US 5,710,303 A · Process for the preparation of alkoxytriazolinones

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- Number: US 5,710,303 A
- Document ID: US5710303A
- Status: Granted
- Kind: A
- Application number: 08/723,706
- Filed: 1996-09-30
- Granted: 1998-01-20
- Earliest claimed: 1994-09-23
- Assignees: Bayer Aktiengesellschaft
- Inventors: Heinz-Jurgen Wroblowsky; Klaus Konig
- Web page: https://patentgrep.com/patent/US5710303A

## CPC

- C07D 249/12: Oxygen or sulfur atoms
- C07C 281/04: the other nitrogen atom being further doubly-bound to a carbon atom
- C07D: HETEROCYCLIC COMPOUNDS (macromolecular compounds C08)
- C07C: ACYCLIC OR CARBOCYCLIC COMPOUNDS

## Abstract

Alkoxytriazolinones of the formula (I), ##STR1## are obtained in good yields and in high purity by reacting iminocarbonic diesters (II) with carbazinic esters (III) ##STR2## at -20.degree. C. to +120.degree. C. (1st step) and subjecting the semicarbazide derivatives (IV) formed in this process with elimination of R.sup.2 --OH ##STR3## to a cyclizing condensation reaction in the presence of a base at 20.degree. C. to 150.degree. C. with elimination of R.sup.3 --OH, if appropriate (2nd step) and, finally, by reacting the resulting 5-alkoxytriazolinones of the formula (V) ›=formula (I) where R.sup.1 =H! with an alkylating agent of the formula R.sup.1 --X (VI) at 0.degree. C. to 150.degree. C., if appropriate in the presence of a base.

## Claims

### Claim 1

The semicarbazide compounds
(a) ethyl N'-(.alpha.-amino-.alpha.-methoxy-methylene)-hydrazine-N-carboxylate ##STR21## and (b) ethyl N'-(.alpha.-amino-.alpha.-propoxy-methylene)-hydrazine-N-carboxylate ##STR22##