通过H 2 O 2硫氧化原位生成的苯并噻吩S-氧化物催化剂介导2-萘酚的氧化偶联。催化过程的关键是使用不寻常的苯并噻吩S-氧化物中断的Pummerer反应,然后与第二个配偶偶合,捕获和转化2-萘酚配偶的反应性。新的催化歧管已在生物活性天然产物(±)-尼莫酮和(±)-异麦酮的合成中得到展示。尽管Pummerer反应被广泛使用,但它们在催化中的应用却很少,我们的方法代表了一种新的无金属C-C键形成的催化流形。
A nickel-catalyzedKumadacoupling of aniline derivatives was developed by selective cleavage of aryl C–N bonds under mild reaction conditions. Without preinstallation of an ortho directing group on anilines, the cross-coupling reactions of Boc-protected aromatic amines with aryl Grignard reagents afforded unsymmetric biaryls. Mechanistic studies by DFT calculations revealed that the nickel-mediated
An enantioselective oxidative coupling of 2-naphthol derivatives is developed with the use of chiral Fe(II)–diphosphine oxide complexes. Optically active 1,1-bi-2-naphthol derivatives can be synthesized in high yields when a 2 : 1 complex of (S)-xylyl-iPrO-BIPHEP-oxide and Fe(OTf)2 is used in the presence of t-butyl hydroperoxide as an oxidant. The non-linear effect, X-ray crystal structure and ESI-MS
mine ligand 8 b possesses an axialchirality. The racemic 8 b was bound to B‐DNA by the accompanying induction of its (P)‐chirality together with the B‐to‐Z helicity change of the duplex DNA, [(dC‐dG)3]2. The (P)‐chirality of the bound 8 b, in turn, transitioned to the (M)‐chirality according to the Z‐helicity of the DNA. These results illustrate the chirality synchronization between the DNA and the
Disclosed are compounds of Formula 1, N-oxides, and salts thereof,
wherein
Q is O or S;
Z
1
and Z
2
are each independently CR
9
or N; and
R
1
, R
2
, R
3
, R
4
, R
5
, R
6
, R
7
, R
8
and R
9
are as defined in the disclosure.
Also disclosed are compositions containing the compounds of Formula 1 and methods for controlling plant disease caused by a fungal pathogen comprising applying an effective amount of a compound or a composition of the invention.