Process for chroman carboxylates

Details Process for chroman carboxylates Process for chroman carboxylates

1996-11-05

1997-12-16

Chan, Nicky

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D31158

Patent

active

056987161

ABSTRACT:
This invention relates to an improved process for the preparation of 5-methylchroman-6-carboxylic acid, a useful intermediate in the preparation of chroman-containing diacylhydrazines which are useful as insecticides, by reacting a Hagemann's ester with a propargyl derivative in the presence of a base and a solvent to produce a propargyl ether, rearranging the propargyl ether by application of heat with a suitable catalyst being present, with or without a solvent, to produce a cyclic ether type compound and isomerizing the cyclic ether type compound with a catalyst in a suitable solvent to produce a chroman ester. The propargyl ethers and the cyclic ether type compounds produced by the process of the present invention are new.

REFERENCES:
Chemical Abstracts, vol. 69, No. 7, Aug. 12, 1968 abstract No. 26830v, G. Sarkar, et al.
Derwent Abstract, Japan Patent No. JP 07010866/PN (Jan. 13, 1995).
Derwent Abstract, Japan Patent No. JP 07109267/PN (Apr. 25, 1995).
Derwent Abstract, Japan Patent No. JP 07109269/PN (Apr. 25, 1995).
Derwent Abstract, Japan Patent No. JP 07126263/PN (May 16, 1995).
Derwent Abstract, Japan Patent No. JP 0133245/PN (May 23, 1995).
Derwent Abstract, Japan Patent No. JP 07133270/PN (May 23, 1995).
Derwent Abstract, Japan Patent No. JP 07133271/PN (May 23, 1995).
Derwent Abstract, Japan Patent No. JP 07179452/PN (Jul. 18, 1995).

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