[EN] STRIGOLACTAM DERIVATIVES AND THEIR USE AS PLANT GROWTH REGULATORS [FR] DÉRIVÉS DE STRIGOLACTAME ET LEUR UTILISATION COMME RÉGULATEURS DE LA CROISSANCE VÉGÉTALE
Baeyer–Villigeroxidation of cyclobutanones is achieved in current developed protocol with 10-methylacridinium perchlorate (AcrH+ClO4−) as a novel organocatalyst both with irradiation at room temperature and without irradiation at elevated temperature. Excellent yields of the corresponding lactones are obtained and the possible mechanism has been proposed.
The present invention relates to novel strigolactam derivatives of formula (I) to processes and intermediates for pre-paring them, to plant growth regulator compositions comprising them and to methods of using them for controlling the growth of plants and/or promoting the germination of seeds.
PHOTOCYCLOADDITION BETWEEN INDENE AND ELECTRON-RICH OLEFINS THROUGH INDENE CATION RADICAL
作者:Kazuhiko Mizuno、Ryoji Kaji、Yoshio Otsuji
DOI:10.1246/cl.1977.1027
日期:1977.9.5
Irradiation of a solution of indene and alkyl vinyl ethers in acetonitrile in the presence of 1-naphthonitrile efficiently gave two stereo-isomeric (2+2) cycloadducts; endo-2-alkoxy-2a,7a-dihydro-7H-cyclobut [a] indene and the corresponding exo-isomer. The quenching and sensitizing experiments suggested that the above cycloadducts were formed via indene cation radical.
A micellar environment enables catalytic, diastereoselective and enantioselective BaeyerâVilliger oxidation of cyclobutanones (ee up to 90%) with H2O2 as oxidant using Co(Salen) catalyst 1, while the same catalytic system is inactive in organic solvents.
A novel approach toward the synthesis of strigolactones through intramolecular [2+2] cycloaddition of ketenes and ketene-iminiums to olefins. Application to the asymmetric synthesis of GR-24
作者:Mathilde Lachia、Pierre M.J. Jung、Alain De Mesmaeker
DOI:10.1016/j.tetlet.2012.06.013
日期:2012.8
ketene-iminium was developed for the preparation of GR-24, a synthetic analogue of the family of strigolactone plant hormones. Excellent levels of regioselectivity and of chiral induction were obtained using a bulky chiral amine for the formation of the cyclobutanone and a subsequent regioselective Baeyer–Villiger afforded the tricyclic lactone core of (+)-GR-24.