89332-93-4Relevant articles and documents
Studies on chromone derivatives: regioselective 1,3-dipolar and 1,4-cycloaddition reactions of 3-cyano-4H-1-benzopyran-4-thione
Sain, Bir,Prajapati, Dipak,Mahajan, Asha R,Sandhu, Jagir S
, p. 313 - 316 (2007/10/02)
1,3-Dipolar cycloaddition reactions of 3-cyano-4H-1-benzopyran-4-thione 1 with nitrilimines 3, nitrile oxides 7 and aldonitrones 8 yielded regioselective cycloadducts involving the thione function.In the latter two classes, the unstable cycloadducts fragmented to yield 3-cyanochromone 11 and isothiocyanate 12 or thioamide 13, respectively.In contrast, dienamines 14 preferred to react at the carbon-carbon double bond in a 1,4-cycloaddition yielding xanthione (9H-xanthene-9-thione) 16 by elimination of HCN and the amine moiety.Keywords: 1,3-dipolar cycloaddition / 1,4-cycloaddition / 4H-1-benzopyran-4-thione / nitrilimine / nitrile oxide / nitrone
Utilization of thiocarbonyl transfer reagents. Preparation of thioamides, mercapto esters, and thiapyran derivatives
Harpp, David N.,MacDonald, J. Gavin,Larsen, Charles
, p. 951 - 957 (2007/10/02)
The reaction of 1,1'-thiocarbonyldiimidazole and 1,1'-thiocarbonylbis(1,2,4-triazole) with several aldonitrones has been found to afford thioamides in good yield.Several 1,1'-thiocarbonylbisazoles, which have been shown to undergo Diels-Alder additions wi
