# US 4,395,551 A · Pyridopyrimidinone compounds

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- Number: US 4,395,551 A
- Document ID: US4395551A
- Status: Granted
- Kind: A
- Application number: 06/329,157
- Filed: 1981-12-10
- Granted: 1983-07-26
- Earliest claimed: 1981-12-10
- Assignees: Uniroyal, Inc.
- Inventors: Mark A. Dekeyser; Benjamin J. Pierce; Richard C. Moore; Winchester L. Hubbard
- Web page: https://patentgrep.com/patent/US4395551A

## CPC

- A01N 57/16: containing heterocyclic radicals
- C07D 471/04: Ortho-condensed systems
- C07D 513/04: Ortho-condensed systems
- C07F 9/6512: having the nitrogen atoms in positions 1 and 3
- C07F 9/6561: containing systems of two or more relevant hetero rings condensed among themselves or condensed with a common carbocyclic ring or ring system, with or without other non-condensed hetero rings
- A01N: PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF (preservation of food or foodstuff A23); BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES (preparations for medical, dental or toiletry purposes which kill or prevent the growth or proliferation of unwanted organisms A61K); PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- C07D: HETEROCYCLIC COMPOUNDS (macromolecular compounds C08)
- C07F: ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM (metal-containing porphyrins C07D487/22)

## Abstract

A compound of the formula ##STR1## wherein R and R.sup.1 together form a 1,3-butadien-1,4-diyl group optionally substituted with a methyl or chloro group and R.sup.2 is halogen is disclosed. The compound is useful as an intermediate in the synthesis of insecticidal organophosphorus compounds.

## Claims

### Claim 1

A compound of the formula ##STR111## wherein R and R.sup.1 together form a 1,3-butadien-1,4-diyl group optionally substituted with a methyl or chloro group and R.sup.2 is halogen.

### Claim 2

A compound selected from the group consisting of:
3-bromo-2-(chloromethyl)-4H-pyrido[1,2-a]pyrimidin-4-one;
6-chloro-2-(chloromethyl)-4H-pyrido[1,2-a]pyrimidin-4-one;
3-chloro-2-(chloromethyl)-4H-pyrido[1,2-a]pyrimidin-4-one;
3,6-dichloro-2-(chloromethyl)-4H-pyrido[1,2-a]pyrimidin-4-one;
2-(chloromethyl)-5-methyl-4H-pyrido[1,2-a]pyrimidin-4-one;
2-(chloromethyl)-7-methyl-4H-pyrido[1,2-a]pyrimidin-4-one; and
3-bromo-6-chloro-2-(chloromethyl)-4H-pyrido[1,2-a]pyrimidin-4-one.