Synthesis of Bis(Carbamoyl Ester) Derivatives of D-Glucose as Antifungal Products
摘要:
Regiospecific carbamoylation of di-O-isopropylidene protected D-glucose gave a series of carbamoyl, thiocarbamoyl and dithiocarbamoyl esters at the C-3 secondary site. These were partially and fully deprotected to give two series of derivatives such that a choice of the extent of hydrophilic character could be made. The partially protected products were further derivatized regioselectively with a second carbamoyl, thiocarbamoyl or dithiocarbamoyl group at the C-6 primary site. We also report on antifungal properties of some of those compounds.
Regioselective carbamoylation of 3-S-(N,N-diethyldithiocarbamate) derivative of D-glucose gave the corresponding 6-O-(N,N-diethylcarbamate)-3-S-(N,N-diethyldithiocarbamate) as main product in yield of 43%. Transcarbamoylation was formed during the esterification in basic media and one of the by-product contained three different carbamic esters: O-carbamic, S-carbamic and O-thiocarbamic esters. The identification of each carbamate derivatives was realized by NMR analysis.