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US 2014/0275505 A1Published application
Process for the preparation of certain triaryl rhamnose carbamates
AssigneeDow AgroSciences LLC
InventorsJames M. RENGA, Anne M. WILSON, Gary D. CROUSE
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Abstract
Triaryl rhamnose carbamate insecticides are prepared from triaryl carbamates and the tetrahydropyran-2-ols in good yield without the use of a hydride base.
Claims8
A process for preparing triaryl rhamnose carbamates of the Formula (I),
- wherein
- R1 represents (C1-C6) haloalkyl or (C1-C6) haloalkoxy, and
- R2 represents (C1-C6) alkyl, (C3-C6) alkenyl or (C3-C6) alkynyl,
- which comprises contacting a triaryl carbamate of Formula (II)
- wherein
- R1 is as previously defined, and
- R3 represents a phenyl group substituted with one or more substituents selected from the group consisting of F, Cl, Br, I, NO2 or CN,
- with a tetrahydropyran-2-ol of Formula (III)
- wherein
- R2 is as previously defined,
- in an inert organic solvent in the presence of a tertiary amine base and an inorganic base at a temperature from about 20° C. to about 100° C.
8 more elements
Dependencies are inferred from the claim text.