The synthesis of pyrroles with insecticidal activity
摘要:
AbstractThe 2‐aryl‐4‐bromo‐5‐trifluoromethylpyrrole‐3‐carbonitriles represent a new class of insect control agents. The high insectidical activity observed in this series prompted us to investigate the preparation of regioisomeric arylhalotrifluoromethylpyrrole carbonitriles. The synthesis and biological activity of eight of the twelve possible regioisomers are described and discussed.
A copper-catalyzed diastereoselective [4 + 2] cyclolization of α,β-unsaturated ketoxime acetates and trifluoromethyl ketones affords various 3-trifluoromethylated 3-hydroxy-cylcohexan-1-ones smoothly. This reaction features the selective functionalization of a less acidic C(sp3)–H bond by an internal oxdative C(sp3)–H functionalization strategy. Preliminary investigations revealed that α,β-unsaturated
The first oxidative C(sp3)−H/C(sp3)−H cross‐dehydrogenative coupling (CDC) reaction promoted by an internal oxidant is reported. This copper‐catalyzed CDC reaction of oxime acetates and trifluoromethylketones provides a simple and efficient approach towards 2‐trifluoromethyldihydropyrrol‐2‐ol derivatives in a highly diastereoselective manner by cascade C(sp3)−C(sp3) bond formation and cyclization
Bis- and tris(trifluoromethyl)arylpyrrole insecticidal and acaricidal
申请人:American Cyanamid Company
公开号:US05157047A1
公开(公告)日:1992-10-20
Bis- and tris(trifluoromethyl)arylpyrrole compounds which are effective for the control of insects and acarids are described. A method for the insecticidal and acaricidal use of said compounds and methods for the preparation of said compounds are presented.
Substituted N-benzoyl-N'-thienylureas, processes for making these compounds, intermediates therefor and the use of the compounds for the control of pests, and in particular for the control of insects and acarids.
Trisubstituted 2-Trifluoromethyl Pyrrolidines via Catalytic Asymmetric Michael Addition/Reductive Cyclization
作者:Michael T. Corbett、Qihai Xu、Jeffrey S. Johnson
DOI:10.1021/ol500679w
日期:2014.5.2
2-trifluoromethyl pyrrolidines by asymmetric Michaeladdition/hydrogenative cyclization is described. The direct organocatalytic addition of 1,1,1-trifluoromethylketones to nitroolefins proceeds under mild reaction conditions and low catalyst loadings to provide Michael adducts in high yield with excellent diastereo- and enantioselectivity. Catalytic hydrogenation of the Michael adducts stereoselectively generates