Spontaneous solid-state [8 + 8] dimerization of cycloheptatrienethione: the first example of a nontopochemically controlled reaction in the ground state
Inverting the reactivity of troponoid systems in enantioselective higher-order cycloaddition
作者:Sebastian Frankowski、Anna Skrzyńska、Łukasz Albrecht
DOI:10.1039/c9cc05638f
日期:——
By the replacement of the oxygen with the sulfur atom in tropone, a novel reactivity pattern of troponoid systems in enantioselective transformation was achieved. It utilizes tropothione as an 8π-component in the [8+2]-cycloaddition involving α,β-unsaturated aldehydes. The stereochemistry of the process is governed through the aminocatalytic LUMO-activation of the carbonyl reactant. It is in marked
The tosylate (1) of tropone oxime undergoes a novel ring-opening reaction under mild conditions with secondary amines, alkoxides, and Grignard reagents affording stereoselectively 6-substituted (1Z,3Z,5Z)-hexa-1,3,5-triene-carbonitriles (2a–h) as sole products in high yields; these are easily converted into Z,Z,E-isomers (3a–h) with acids and further into E,E,E-isomers (4a–h) as the final form by stronger
The present disclosure provides compounds of the formula (I), (II), (III), wherein the variables are as defined herein for use in the treatment of fungal infections. In some embodiments, the fungal infection is an infection of Cryptococcus neojormans fungus. Also provided herein are compositions comprising a compound of formula I, II, or III and a second anti-fungal agent.
Aromaticity of a Newly Synthesized Azulenone, Cyclohepta[<i>b</i>]thiophen-2-one
作者:Takahisa Machiguchi、Shinichi Yamabe
DOI:10.1246/cl.1990.1511
日期:1990.9
Tropothione reacts with chloroketene to give 1-thia-2-azulenone (1) in addition to a 1:2 adduct. An MO calculation suggests that the latter is formed via a novel one-site electrophilic addition of chloroketene to 1.
Tropothione has been effectively synthesized as unstable red crystals and fully characterized by various spectroscopies as well as pKa and dipole moment measurements together with chemical characterization reactions. The properties of tropothione was revealed to differ considerably from those of tropone.