申请人:SHELL INTERNATIONALE RESEARCH
MAATSCHAPPIJ B.V.
公开号:EP0652215A1
公开(公告)日:1995-05-10
There are described novel insecticidal and acaricidal compounds of the general formula
wherein X represents a methylene group, or a sulphur atom or a group of general formula NR¹ wherein R¹ represents a hydrogen atom, a C₁₋₄ alkyl group or a C₁₋₅ acyl group;
n represents 2 or 3;
m represents 0, 1 or 2;
A represents an optionally substituted heteroaryl group; and
R represents a chlorine, bromine or iodine atom or a C₁₋₄ haloalkyl group; together with preparative processes and novel intermediates.
The synthesis of new β-aminovinyl chloro-difluoromethylated ketones 1 and 2 is presented. In some of them the activation of the C–Cl bond was achieved, undermildconditions, using indium powder. The corresponding difluoro-enolates were trapped with a series of aromatic and heterocyclic aldehydes, to furnish the corresponding difluoromethylene aldol products 3 and 4, in moderate to good yields. The