New access to thioglycolurils by condensation of 4,5-dihydroxyimidazolidin-2-ones(thiones) with HSCN
摘要:
A general and highly effective protocol for the direct synthesis of mono- and dithioglycolurils containing various substituents at the 1,3-nitrogen atoms has been developed based on the condensation of easily accessible dihydroxyimidazolidin-2-ones with HSCN under mild reactions conditions. (C) 2015 Elsevier Ltd. All rights reserved.
The synthesis, structure, and electron density distribution in crystals of 4,5-dihydroxyimidazolidine-2-thiones
作者:Yu. V. Nelyubina、G. A. Gazieva、V. V. Baranov、P. A. Belyakov、A. O. Chizhov、K. A. Lyssenko、A. N. Kravchenko
DOI:10.1007/s11172-009-0181-5
日期:2009.7
dihydroxyimidazolidine-2-thione and its carbonyl analog performed in the framework of detailed investigation of the electron density distribution in the corresponding crystals revealed the reason for different number and geometric parameters of the hydrogen bonds formed by the (thio)carbonyl groups in the crystals.
precursor of all cucurbiturils, its sulfur analog represents a yet unmet syntheticchallenge. The reaction between glyoxal and thiourea was found to stop at the level of dihydroxyimidazolidine-2-thione, which is quite unstable under various acidic conditions. In an attempt to answer these questions, several stable analogs of thioglycoluril, that is, monothioglycoluril, ditolylthioglycoluril, and its diether
New access to thioglycolurils by condensation of 4,5-dihydroxyimidazolidin-2-ones(thiones) with HSCN
作者:Vladimir V. Baranov、Yulia V. Nelyubina、Angelina N. Kravchenko、Natalya G. Kolotyrkina、Ksenia A. Biriukova
DOI:10.1016/j.tetlet.2015.09.071
日期:2015.10
A general and highly effective protocol for the direct synthesis of mono- and dithioglycolurils containing various substituents at the 1,3-nitrogen atoms has been developed based on the condensation of easily accessible dihydroxyimidazolidin-2-ones with HSCN under mild reactions conditions. (C) 2015 Elsevier Ltd. All rights reserved.