Catalytic Electrophilic Thiocarbocyclization of Allenes
作者:Quanbin Jiang、Huimin Li、Xiaodan Zhao
DOI:10.1021/acs.orglett.1c03270
日期:2021.11.19
An efficient approach via catalytic electrophilic thiocarbocyclization of allenes to construct indene-based sulfides with excellent regioselectivities is disclosed. The reactions were carried out at low temperatures by selenide catalysis in the presence of TMSOTf. Not only electrophilic arylthio reagents but also electrophilic alkylthio reagents worked well under these conditions. Furthermore, the
well as CuI and CuII species. The resulting diamond‐supported Cu NPs were highly active for the selective aerobicoxidation of aromatic thiols to the corresponding disulfides, whereas aliphatic thiols exhibited much lower reactivity because of some poisoning and catalyst deactivation produced by aliphatic thiols. The Cu catalysts used for thiophenol oxidation could be reused in four consecutive runs with
Novel ureas of the formula ##STR1## wherein A and B are chlorine or A is chlorine or hydrogen and B is --CF.sub.3, R and R.sub.1 are individually alkyl of 1 to 3 carbon atoms and R.sub.2 is alkyl of 1 to 6 carbon atoms optionally substituted with a halogen having herbicidal properties, particularly useful in cultivated grass crops and their preparation and use.
Catalytic Asymmetric α‐Alkylsulfenylation with a Disulfide Reagent
作者:Mingying Shi、Qi Zhang、Jiali Gao、Xueling Mi、Sanzhong Luo
DOI:10.1002/anie.202209044
日期:2022.9.26
A disulfide-based alkylthio transfer reagent was developed for the asymmetric α-alkylsulfenylation of ketones and aldehydes, showing good activity and stereoselectivity when combined with primary amine organocatalysis.