aliphatic carbonyl reduction over aromatic carbonyl reduction. Moreover, the reaction showed good functional group tolerance and broad substrate scope as well as great potential in the late-stage modification and synthesis of natural products and pharmaceutical skeletons. Preliminary mechanistic studies and DFT calculations revealed that this reaction involved the deoxygenation of 1,3-diketone to α, β-unsaturated
1-carbamoyl-2-pyrazolines, composition containing them, and insecticidal
申请人:Ciba-Geigy Corporation
公开号:US04874778A1
公开(公告)日:1989-10-17
The invention relates to 1-carbamoyl-3-phenyl-4-benzyl-.DELTA..sup.2 -pyrazolines of the formula ##STR1## wherein R.sub.1 and R.sub.2 are each independently hydrogen, methyl halogen, trifluoromethyl, C.sub.1 -C.sub.4 haloalkoxy containing 1 to 7 halogen atoms or C.sub.1 -C.sub.4 haloalkylthio containing 1 to 7 halogen atoms; R.sub.3 is hydrogen, halogen, C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 haloalkyl containing 1 to 7 halogen atoms, C.sub.1 -C.sub.4 alkoxy, C.sub.1 -C.sub.4 haloalkoxy containing 1 to 7 halogen atoms or alkoxycarbonyl containing 1 to 4 carbon atoms in the alkyl moiety; R.sub.4 is hydrogen, halogen, C.sub.1 -C.sub.4 alkyl or trifluoromethyl; R.sub.5 is hydrogen, halogen, C.sub.1 -C.sub.4 alkyl, trifluoromethyl or C.sub.1 -C.sub.4 alkoxy; and R.sub.6 and R.sub.7 are each independently hydrogen, halogen or trifluoromethyl or R.sub.6 and R.sub.5 or R.sub.7 and R.sub.5 are methylenedioxy; to the preparation of these compounds and to compositions containing them for controlling insects and representatives of the order Acarina, especially plant-destructive feeding insects and soil insects.
Ruthenium-Catalyzed 1,3-Aryl Redox Isomerization of Allylic Alcohols
作者:Zhen Luo、Xue Zhang、Zheng-Qiang Liu、Chuan-Ming Hong、Qing-Hua Li、Tang-Lin Liu
DOI:10.1021/acs.orglett.2c03410
日期:2022.11.4
The isomerization of allylicalcohols to the corresponding carbonyl compounds is a well-established reaction in organic synthesis. However, 1,3-carbon migration is a quite challenging field, and thus transformation has remained elusive until now. Herein, we present the ruthenium-catalyzed intramolecular 1,3-aryl migrative isomerization, which provides a mild and environmentally friendly method to synthesize
Domino Reactions Containing Different Types of Heck Reactions for Selective 3,3- and 1,3-Diarylations of Propenol with Aryl Halides by Triple Catalysis
A new domino Heck-isomerization/Saegusa/Heck reaction of propenol with aryl iodides has been developed for the synthesis of 3,3-diaryl propenals by triple transition-metal catalysis. Moreover, we also developed the domino Heck-isomerization/Heck-type reaction of propenol with aryl iodides for the synthesis of 1,3-diaryl propanones by double transition-metal catalysis and the mediation of secondary amine or triple transition metal catalysis and aminocatalysis.