established that a cyclopentadienyl RhIII complex with two phenyl groups and a pendant amide moiety catalyzes the formal Lossen rearrangement/[3+2] annulation cascade of N‐pivaloyl benzamides and acrylamides with alkynes leading to substituted indoles and pyrroles. Mechanistic studies revealed that this cascade reaction proceeds via not the Lossen rearrangement to form anilides or enamides but C−H bond cleavage
Biphenyl-Based Diaminophosphine Oxides as Air-Stable Preligands for the Nickel-Catalyzed Kumada-Tamao-Corriu Coupling of Deactivated Aryl Chlorides, Fluorides, and Tosylates
couple: Cooperative bimetallic activation of CF and CO bonds gave rise to easy coupling with arylfluorides and tosylates. Novel air‐ and moisture‐stable diaminophosphine oxides derived from 1,1′‐biphenyl‐2,2′‐diamine proved to be versatile preligands for the nickel‐catalyzed cross‐coupling of aryl Grignard reagents with a variety of deactivated aryl chlorides, fluorides, and tosylates (see scheme)
Gold(I)‐polyoxometalate hybrid complexes 1–4 ([PPh3AuMeCN]xH4−xSiW12O40, x=1–4) were synthesized and characterized. The structure of the primary gold(I)–polyoxometalate 1 (x=1) was fully ascertained by XRD, FTIR, 31P and 29Si magic‐angle spinning (MAS) NMR, mass spectroscopy, and SEM–energy dispersive X‐ray spectroscopy (EDX) techniques. Moreover, this complex exhibited better catalytic activity and
Cu-Catalyzed Cascades to Carbocycles: Union of Diaryliodonium Salts with Alkenes or Alkynes Exploiting Remote Carbocations
作者:Fengzhi Zhang、Shoubhik Das、Andrew J. Walkinshaw、Alicia Casitas、Michael Taylor、Marcos G. Suero、Matthew J. Gaunt
DOI:10.1021/ja504361y
日期:2014.6.25
Copper-catalyzed cascade reactions between alkenes or alkynes and diaryliodonium salts form carbocyclic products in a single step. Arylation of the unsaturated functional group is proposed to form a carbocation intermediate that facilitates hydride shift pathways to translocate the positive charge to a remote position and enables ring formation via a Friedel-Crafts-type reaction.
The present invention provides benzoxazinones of formula I wherein R1 is hydrogen or halogen; R2 is hydrogen, C1-C6-alkyl, C1-C6-haloalkyl, C3-C6-cycloalkyl, C3-C6-alkenyl, C3-C6-haloalkenyl, C3-C6-alkynyl, C3-C6-haloalkynyl, C1-C6-alkoxy or C3- C6-cycloalkyl-C1-C6-alkyl; R3 is halogen; R4 is halogen; X is O or S; and Y is a substituted or unsubstituted heterocycle; Benzoxazinones of formula I are useful as herbicides.