Arylidene semicarbazones and their utility as herbicides
申请人:STAUFFER CHEMICAL COMPANY
公开号:US03753680A1
公开(公告)日:1973-08-21
Substituted-arylidene semicarbazone having the formula:
取代芳基亚胺脲酮的化学式为:
One‐Pot Catalytic Enantioselective Synthesis of 2‐Pyrazolines
作者:Connor J. Thomson、David M. Barber、Darren J. Dixon
DOI:10.1002/anie.201811471
日期:2019.2.18
A scalable, one‐pot, enantioselective catalytic synthesis of 2‐pyrazolines from beta‐substituted enones and hydrazines is described. Pivoting on a two‐stage catalytic Michael addition/condensation strategy, the use of an aldehyde to generate a suitable hydrazone derivative of the hydrazine was found to be key for curtailing background reactivity and tuning the catalyst‐controlled enantioselectivity
1-Methyl(or phenyl)-5-(penta-O-acetyl-d-galacto-pentitol-1-yl)pyrazoles from the reactions of 3,4,5,6,7-penta-O-acetyl-1,2-dideoxy-1-nitro-d-galacto-hept-1-enitol with aldehyde methyl(or phenyl)hydrazones
作者:Manuel Gómez-Guillén、José María Lassaletta Simon
DOI:10.1016/0008-6215(91)80121-3
日期:1991.3
hept-1-enitol ( 2 ) reacted with aldehydemethyl(or phenyl)hydrazones in refluxing methanol or butyl acetate to give 1-methyl(or phenyl)-5-(penta- O -acetyl- d - galacto -pentitol-1-yl)pyrazoles in good (for 1-methylpyrazoles) or moderate yields (for 1-phenylpyrazoles). The O -deacetylated products were obtained in high yields. A Michael-type adduct was obtained for the reactions of 2 with p -tolualdehyde
Acid‐Mediated Three Component Assembly of 4‐Fluoropyrazoles from α‐Fluoronitroalkenes, Hydrazines, and Aldehydes
作者:Vladimir A. Motornov、Andrey A. Tabolin、Yulia V. Nelyubina、Valentine G. Nenajdenko、Sema L. Ioffe
DOI:10.1002/ejoc.202000841
日期:2020.8.31
Three‐component one pot assembly of 4‐fluoropyrazoles is described. The method involves formal oxidative [3+2]‐annulation between elusive fluoroalkynes and azomethine imines.