Addition of Organolithium Reagents to Some Carbohydrate Enones
作者:Osman Achmatowicz、Barbara Szechner、Jan K. Maurin
DOI:10.1016/s0040-4020(97)00253-6
日期:1997.4
Addition of organolithiumreagents to the sugar enones: alkyl 2,3,6-trideoxy-α-l- and 2,3-dideoxy-α-d-hex-2-enopyranosid-4-ulose has been examined. Butyl, benzyl and 2,5-dimethoxy-4-methylphenyllithium add, with increasing stereoselectivity, to the carbonyl group of the α,β-unsaturated ketosugars, whereas 2,5-dimethoxybenzyllithium undergoes stereospecific conjugate addition and 1,2-addition in the
The absolute configuration of P-1894B, a potent prolyl hydroxylase inhibitor.
作者:KAZUHIKO OHTA、EIJI MIZUTA、HISAYOSHI OKAZAKI、TOYOKAZU KISHI
DOI:10.1248/cpb.32.4350
日期:——
The previous X-ray-crystallographic determination of the relative configuration of P-1894B, a potent prolyl hydroxylase inhibitor isolated from the culture broth of Streptomyces albogriseolus, was extended by means of chemical and spectral studies. The absolute configuration of P-1894B (1) was established from the absolute configuration of two constituent monosaccharides, L-aculose (3) and L-rhodinose (4), produced by chemical degradation of 1. The absolute configuration of the aglycone part (aquayamycin) was also established as 2. The stereostructure of the reduction product (11) obtained by the catalytic hydrogenation of 1 was also elucidated.
Divergent de novo synthesis of all eight stereoisomers of 2,3,6-trideoxyhexopyranosides and their oligomers
作者:Wangze Song、Yu Zhao、John C. Lynch、Hyunjin Kim、Weiping Tang
DOI:10.1039/c5cc07787g
日期:——
All eight possible stereoisomers of 2,3,6-trideoxyhexopyranosides are prepared systematically from furan derivatives by a sequence of Achmatowicz rearrangement, Pd-catalysed glycosidation, and chiral catalyst-controlled tandem reductions. This sequence provides access to...
Short and Efficient Synthetic Route to Methyl α-Trioxacarcinoside B and Anomerically Activated Derivatives
作者:Thomas Magauer、Andrew G. Myers
DOI:10.1021/ol202315m
日期:2011.10.21
A 9-step syntheticroute to the complex carbohydrate methyl α-trioxacarcinoside B from 2-acetylfuran is described. Anomerically activated forms, including 1-phenylthio, 1-O-(4′-pentenyl), 1-fluoro, and 1-O-acetyl derivatives are also prepared.