Phthalazinones made easy! A new, straightforward methodology for the carbonylativesynthesis of phthalazinones has been established. Starting from readily available 2‐bromobenzaldehydes or 2‐bromoacetophenone and hydrazines, a variety of phthalazinones have been produced in good isolated yields (see scheme).
The invention provides compounds of formula:
wherein the symbols are as defined in the description, which possess utility as pesticides (e.g. herbicides and insecticides).
Convenient method for the synthesis of phthalazinones via carbonylation of 2-bromobenzaldehyde using Co2(CO)8 as a CO source
作者:A. Sivalingam Suresh、Poongavanam Baburajan、Mansur Ahmed
DOI:10.1016/j.tetlet.2014.04.082
日期:2014.6
A simple one-pot synthesis of phthalazinones by the condensation and intra-molecular carbonylative cyclization of 2-bromobenzaldehydes with hydrazines is reported. This method utilizes solid Co2(CO)8 as carbonyl source making it readily accessible in small-scale laboratory applications.
Herein an efficient and simple protocol was developed for the synthesis of pyrazoles and phthalazin-1(2H)-ones from a common precursor hydrazines catalyzed by nickelchloride. The reactions proceeded in water at room temperature. The advantages of the protocol are that both the medicinally important scaffolds could be synthesized with low-cost catalyst, green solvent, relatively lower reaction time