76799-04-7Relevant academic research and scientific papers
Simple and efficient synthesis of O-unprotected glycosyl thiourea and isourea derivatives from glycosylamines
López, óscar,Maya, Inés,Fuentes, José,Fernández-Bola?os, José G.
, p. 61 - 72 (2007/10/03)
Practical, facile and high-yielding one-pot syntheses of different O-unprotected glycopyranosyl thioureas and thioureido bolaamphiphiles (two-step synthesis) and of 2-amino-4,5-dihydro-(1,2-dideoxy-β-D-glucopyranoso)[1,2- d]oxazoles (three-step synthesis) from glycopyranosylamines are reported. The method involves the preparation of O-unprotected β-D-gluco (and D-galacto)pyranosyl isothiocyanates which are in equilibrium with the corresponding 1,2-cyclic thiocarbamates, coupling with amines to afford glycosyl thioureas and treatment with yellow mercury (II) oxide to give trans-fused bicyclic isoureas. A D-gluco trehazolin analogue is prepared in this way. In situ transformation of N,N-dialkyl, N′-glucopyranosyl thioureas into the corresponding ureas is also reported.
Expeditious synthesis of cyclic isourea derivatives of β-D-glucopyranosylamine
López, óscar,Maya, Inés,Ulgar, Víctor,Robina, Inmaculada,Fuentes, José,Fernández-Bola?os, José G.
, p. 4313 - 4316 (2007/10/03)
2-(Alkylamino, dialkylamino, arylamino)tetrahydropyrano[2,3-d]oxazoles are prepared in good yield by a one-pot three-step synthesis from O-unprotected β-D-glucopyranosylamine, by its transformation into glucopyranosyl isothiocyanate in dioxane-water, coupling with amines, and reaction of the corresponding thioureas with yellow mercury(II) oxide in the same reaction medium. In the case of diethylamine prolonged reaction time during the last step, with an extra portion of yellow HgO, led to N,N-diethyl-N′-(β-D-glucopyranosyl)urea in a one-pot four-step synthesis. 2-(β-D-Glucopyranosylamino)tetrahydropyrano[2,3-d]oxazole, an analogue of trehazolin, is obtained in good yield by cyclocondensation of 1,3-bis(β-D-glucopyranosyl)thiourea.
