N-Primary-amine tetrapeptide-catalyzed highly asymmetric Michael addition of aliphatic aldehydes to maleimides
作者:Zhi-Hong Du、Wen-Juan Qin、Bao-Xiu Tao、Meng Yuan、Chao-Shan Da
DOI:10.1039/d0ob01457e
日期:——
highly asymmetric Michaeladdition reaction between maleimides and aliphatic aldehydes catalyzed by low-loading β-turn tetrapeptides with excellent yields and enantioselectivities at room temperature was reported. α-Branched and α-unbranched aldehydes both are suitable nucleophiles. N-Aryl, alkyl and hydrogen maleimides all are well tolerated and led to high yields and enantioselectivities. The transformation
of iminyl radical‐triggered 1,5‐hydrogen atom transfer and (5+2) or (5+1) annulation processes, a series of structurally novel and interesting azepine and spiro‐tetrahydropyridine derivatives have been successfully prepared in moderate to good yields. This method utilizes FeCl2 as the catalyst and readily available oximes as five‐atom units, while showcasing broad substrate scope and good functional
Heterocylic fluoroalkenyl thioethers and the use thereof as pesticides (IV)
申请人:——
公开号:US20030187259A1
公开(公告)日:2003-10-02
The present invention relates to novel heterocyclic fluoroalkenyl thioethers of the formula (I)
1
in which
m represents integers from 3 to 10,
n represents 0, 1 or 2 and
Het represents the following, in each case optionally substituted, groupings:
2
and to processes for their preparation and to their use as pesticides.
Use of riboflavin and flavin derivatives as chitinase inhibitors
申请人:——
公开号:US20030191091A1
公开(公告)日:2003-10-09
The invention relates to the use of riboflavin and of flavin derivatives with chitinase-inhibitory action for controlling arthropods, nematodes and chitin-containing fungi.
Synthesis of N-halogenated phenyl maleimide compounds with tin
申请人:Atlantic Richfield Company
公开号:US04705866A1
公开(公告)日:1987-11-10
A process for the preparation of N-brominated or N-chlorinated phenylmaleimide by reacting maleic anhydride and a brominated or chlorinated aniline compound at temperatures of from about 100.degree. C. to about 210.degree. C. in the presence of tin containing catalyst compound and optionally an inert solvent.