Design and synthesis of novel spirocyclopropyl cyclohexane-1,3-diones and -1,3,5-triones for their incorporation into potent HPPD inhibitors
摘要:
We report the design and the efficient synthesis of novel spirocyclopropyl cyclohexane-1,3-dione and -1,3,5-trione units to be incorporated into potent HPPD inhibitors. New routes involving original combinations of synthetic equivalents of alpha-cyclopropyl ketone-alpha-anion and alpha-cyclopropyl ester-beta-cation are described. (C) 2010 Elsevier Ltd. All rights reserved.
reactions such as Michael and aldol reactions in aqueous media and the H−D exchange reactions using deuterium oxide. For example, a 200-mmol-scale Michael reaction under triphasic conditions proceeded rapidly, with an extremely high turnover number of up to 260 400 and an excellent turnover frequency of 48 s-1. No vanadium leaching was detected during the above reactions, and the catalyst was readily recycled
1
Compounds of formula (I), in which the substituents are as defined in claim 1 and the agrochemically tolerated salts M+ and all stereoisomers and tautomers of the compounds of formula (I) are suitable for use as herbicides.
E-factor minimized protocols for the polystyryl-BEMP catalyzed conjugate additions of various nucleophiles to α,β-unsaturated carbonyl compounds
作者:Simona Bonollo、Daniela Lanari、Julie M. Longo、Luigi Vaccaro
DOI:10.1039/c1gc16088e
日期:——
Efficient protocols for the addition of carbon-, sulphur- and nitrogen-nucleophiles to α,β-unsaturated carbonylcompounds catalyzed by PS-BEMP have been reported. The adoption of solvent-free conditions (SolFC) was crucial for improving the efficiency of all the processes, while by using an organic reaction medium poor results were obtained. Addition reactions were performed by using equimolar amounts
Michael addition of various β-ketoesters with several Michael acceptors in water containing 10 mol% of N-phenyltris(dimethylamino)iminophosphorane results in high yield conversion to the corresponding adducts.
Utilization of Nonionic Bases in Water as a Highly Efficient Organocatalytic System for Michael Addition of β‐Ketoesters
作者:David Bensa、Jean Rodriguez
DOI:10.1081/scc-120030703
日期:2004.12.31
Michael addition of various beta-ketoesters with several Michael acceptors in water containing 5 mol% of a nonionic base such as phosphazenes, guanidines, and more classical nitrogen containing derivatives or triphenyl phosphine results in high yield conversion to the corresponding adducts. The study also clearly establishes the benefical use of water as solvent compared to more conventional organic medium.