报道了钯催化的分子内α-芳基化和脱氟芳构化策略,用于合成多取代的2-萘酚。该方法以邻溴苄基取代的α-氟酮为底物,并以乙酸钯/三苯膦为催化剂,具有良好的官能团耐受性,易于获得的催化剂和起始原料以及高收率的特点。该策略的应用通过合成有用的结构单元(例如,石脑油[2,3- b ]呋喃,萘酚AS-D和配体/催化剂)得到证明。
Enantioselective Nickel-Catalyzed Reductive Aryl/Alkenyl–Cyano Cyclization Coupling to All-Carbon Quaternary Stereocenters
作者:Zi-Hao Chen、Rui-Ze Sun、Fei Yao、Xu-Dong Hu、Long-Xue Xiang、Hengjiang Cong、Wen-Bo Liu
DOI:10.1021/jacs.2c01237
日期:2022.3.23
An enantioselective nickel-catalyzed intramolecular reductive cross-coupling of C(sp2) electrophiles and cyano groups is reported. Enantioenriched CN-containing all-carbonquaternarystereocenters are assembled by desymmetrizing cyclization of aryl/alkenyl halide-tethered malononitriles. The use of an organic reductant, (EtO)2MeSiH, is crucial to the enantioselectivity and reactivity. Applications
Isoxazoline derivative and herbicide comprising the same as active ingredient
申请人:——
公开号:US20040110749A1
公开(公告)日:2004-06-10
An isoxazoline derivative represented by the following general formula [I]:
1
wherein R
1
and R
2
may be the same or different and are each an alkyl group;
R
3
, R
4
, R
5
and R
6
are each a hydrogen atom;
Y is an optionally substituted 5- to 6-membered aromatic heterocyclic group or fused aromatic heterocyclic group having a hetero atom selected from a nitrogen atom, a oxygen atom and a sulfur atom; and
n is an integer: of 0 to 2.
The isoxazoline derivative has an excellent herbicidal effect and an excellent selectivity between crop and weed.