[EN] TROPOLONE DERIVATIVES AND TAUTOMERS THEREOF FOR IRON REGULATION IN ANIMALS [FR] DÉRIVÉS DE TROPOLONE ET LEURS TAUTOMÈRES POUR LA RÉGULATION DU FER CHEZ LES ANIMAUX
The directed zincation of tropolone derivatives was achieved using TMPZnCl·LiCl. Various functionalizations of the zincated intermediates by halogenation, acylation, allylation, and Negishicross-coupling were successfully performed. Additionally, 1,8-conjugate addition–elimination reactions with a variety of arylmagnesium and secondary alkylzinc reagents were carried out to further elaborate the tropolone
The arylmethyl and diarylmethyl ethers of tropolones were oxidized to the corresponding carbonyl derivatives by heating in dimethyl sulfoxide. The free alcohols were oxidized at a much slower rate, suggesting that some sort of DMSO-linked intermediates are responsible for the oxidation. Inertness of free alcohols was proven by means of the cross-over experiments, including deuterium-labelling. This oxidation was applicable to alkyl ethers, but not to alkenyl ethers, which are known to cause the Claisen-rearrangement.
Asymmetric Induction With Cyclodextrins: Photocyclization of Tropolone Alkyl Ethers
作者:Smriti Koodanjeri、Abraham Joy、V Ramamurthy
DOI:10.1016/s0040-4020(00)00523-8
日期:2000.9
Employing the photobehavior of tropolone alkyl ethers as the probe, we have established that cyclodextrins could as a serve as a medium to bring about enantioselective photoreactions. The enantioselectivity observed in this study is moderate at best. The enantioselectivity observed in the solid state in comparison to aqueous solution suggests that a rigid environment may be essential to achieve chiral
A homochiral porous metal–organic framework for enantioselective adsorption of mandelates and photocyclizaton of tropolone ethers
作者:Yongwu Peng、Tengfei Gong、Yong Cui
DOI:10.1039/c3cc43549k
日期:——
A chiral porous metalâorganic framework of an axially C2-symmetric 1,1â²-biphenol ligand is constructed and can be used as a solid-state host to enanioselectively adsorb mandelates with up to 93.1% ee and to entrap achiral tropolone ethers and induce their asymmetric photocyclization with up to 98.5% ee.
Diels–Alder Reaction of Tropones with Arynes: Synthesis of Functionalized Benzobicyclo[3.2.2]nonatrienones
作者:Manikandan Thangaraj、Sachin Suresh Bhojgude、Rajesh H. Bisht、Rajesh G. Gonnade、Akkattu T. Biju
DOI:10.1021/jo500819w
日期:2014.5.16
A new procedure for the mild, practical, and scalable Diels–Alder reaction of tropones with arynes is reported. Differently substituted tropones undergo selective [4 + 2] cycloaddition with arynes generated in situ by the fluoride-induced 1,2-elimination of 2-(trimethylsilyl)aryl triflates, allowing the formation of functionalized benzobicyclo[3.2.2]nonatrienone derivatives in moderate to good yields