作者:Bohumil Steiner、Vratislav Langer、Miroslav Koóš
DOI:10.1016/j.carres.2009.06.031
日期:2009.10
The formation of (4R)-4-carbamoyl-4-[(4R)-3-O-benzyl-1,2-O-isopropylidene-beta-L-threofuranos-4-C-yl]-oxazolidin-2-one instead of expected imidazolidin-2,4-dione (hydantoin) derivative from 5-amino-5-cyano-5-deoxy-3-O-benzyl-1,2-O-isopropylidene-alpha-D-glucofuranose or 3-O-benzyl-1,2-O-isopropylidene-alpha-D-xylo-hexofuranos-5-ulose under Bucherer-Bergs reaction conditions is reported. Single crystal X-ray diffraction data revealed that T-3(4) is the prefered conformation for the furanose ring, while E-2 and T-2(1) conformations are adopted by the 1,3-dioxolane and 2-oxazolidinone five-membered rings, respectively. (C) 2009 Elsevier Ltd. All rights reserved.