Catalytic Asymmetric (3 + 3) Cycloaddition of Oxyallyl Zwitterions with α-Diazomethylphosphonates
作者:Yan Liu、Xian Peng、Rui She、Xin Zhou、Yungui Peng
DOI:10.1021/acs.orglett.1c02809
日期:2021.9.17
The unique structure of oxyallyls represents a significant challenge for their catalyticasymmetric applications. Herein, an unprecedented chiral imidodiphosphoric acid-catalytic enantioselective (3 + 3) cycloaddition between oxyallyl zwitterions generated in situ from α-haloketones and α-diazomethylphosphonates was developed. Pharmaceutically interesting chiral pyridazine-4(1H)-ones were obtained
Nickel catalyzed electrosynthesis of ketones from organic halides and metal carbonyls
作者:E. Dolhem、M. Oçafrain、J.Y. Nédélec、M. Troupel
DOI:10.1016/s0040-4020(97)10143-0
日期:1997.12
Ketones can be easily obtained by electroreduction in an undivided cell of an organichalide - metal carbonyl mixture using a Ni-bpy catalytic system in DMF (bpy = 2,2′-bipyridine). The process is especially well convenient for primary benzyl and alkyl halides.
A class of 3-phenyl-4(1H)-pyridones and pyridinethiones are broad-spectrum herbicides. The new compounds are characterized by a small substituent on the nitrogen, and usually bear a 5-substituent chosen from a class described herein. The phenyl ring may be substituted. The compounds are effective herbicides when applied both before and after the emergence of weeds, and are particularly useful for the control of weeds in cotton and rice cropland.