Blue Light Promoted Difluoroalkylation of Aryl Ketones: Synthesis of Quaternary Alkyl Difluorides and Tetrasubstituted Monofluoroalkenes
作者:Kangkui Li、Jingchao Chen、Chunhui Yang、Keyang Zhang、Chunxiang Pan、Baomin Fan
DOI:10.1021/acs.orglett.0c01294
日期:2020.6.5
cost-effective method for the preparation of fluoroalkylated compounds has been described by the direct photoexcitation of halofluoroalkanes with blue light absorptivity, enabling the difluoroalkylation of arylketones. The methodology has provided an efficient, mild, and catalyst-free synthetic method for quaternary difluoroalkylated arenes and tetrasubstituted monofluoroalkenes.
Highly stereoselective nickel-catalyzed difluoroalkylation of aryl ketones to tetrasubstituted monofluoroalkenes and quaternary alkyl difluorides
作者:Chao Li、Yi-Xuan Cao、Ruo-Xing Jin、Kang-Jie Bian、Zi-Yang Qin、Quan Lan、Xi-Sheng Wang
DOI:10.1039/c9sc02806d
日期:——
stereo-defined tetrasubstituted monofluoroalkenes or quaternary alkyl difluorides from secondary or tertiary ketones, respectively, has been established. Mechanistic investigations indicated that these C-H fluoroalkylations proceed via a Ni(i)/Ni(iii) catalytic cycle. An obvious fluorine effect was observed in the reaction, and this reaction has demonstrated high stereoselectivity, mild conditions, and broad
Abstract Methyl-2-(3-oxo-3-aryl) benzoates derived from acid catalyzed air oxidative fragmentation of 2-aryl-1-tetralones were efficiently undergone intramolecular-Claisen condensation in the presence of potassium tertiary butoxide. The resulting 2-benzoyl-1-indanones formed in two-step ring contractions were further subjected to indium triflate mediated retro-Claisen condensation to get 1-indanones
Compounds to the formula
wherein
Q is
A is an optionally substituted 1,2 or 3-atom bridge having 0 to 3 carbon atoms and 0 to 1 oxygen atom. NR6 or S(O)q group;
B is H or an organic group;
J is H, alkyl or phenyl;
K is H or CH3;
R1 and R2 are organic or inorganic substituents;
X is 0 or S;
Y is H or an organic substituent;
exhibit insecticidal activity and may be utilised for plant protection.
式中的化合物
式中
Q 是
A 是具有 0 至 3 个碳原子和 0 至 1 个氧原子的任选取代的 1、2 或 3 个原子桥。NR6 或 S(O)q 基团;
B 是 H 或有机基团
J 是 H、烷基或苯基
K 是 H 或 CH3;
R1 和 R2 是有机或无机取代基;
X 是 0 或 S;
Y 是 H 或有机取代基;
具有杀虫活性,可用于植物保护。
Substituted indazoles as arthropodicides
申请人:E.I. DU PONT DE NEMOURS AND COMPANY
公开号:EP0365201A1
公开(公告)日:1990-04-25
Indazole arthropodicides, compositions containing them and a method for controlling arthropods employing these indazoles as the active ingredient. The indazoles have the following general formula:
wherein
Q is a substituted indazole residue;
X is 0 or S;
Y is H or an organic group of defined structure;
R1 is H or a substituent group; and
m is 1 to 3.
吲唑类节肢动物杀虫剂、含有这些杀虫剂的组合物以及使用这些吲唑类活性成分控制节肢动物的方法。吲唑类杀节肢动物剂的通式如下
式中
Q 是取代的吲唑残基;
X 是 0 或 S
Y 是 H 或定义结构的有机基团;
R1 是 H 或取代基;以及
m 为 1 至 3。