Synthesis of Sugar-Derived 2′- and 3′-Substituted Furans and Their Application in Diels−Alder Reactions
作者:Sławomir Jarosz、Mateusz Mach、Katarzyna Szewczyk、Stanisław Skóra、Zbigniew Ciunik
DOI:10.1002/1099-0690(200108)2001:15<2955::aid-ejoc2955>3.0.co;2-0
日期:2001.8
A convenient synthesis of 2′- and 3′-furyl sugars in which the furan and the sugar parts are directly connected is presented. The key step comprises HF·py-induced cyclization of α,β-unsaturated carbonyl compounds (ketones or aldehydes) possessing terminal hydroxymethylene groups protected as TBDPS ethers. Treatment of such furan derivatives with N-phenylmaleimide under high-pressure conditions (11
提出了一种2'-和3'-呋喃糖的便捷合成方法,其中呋喃和糖部分直接相连。关键步骤包括HF·py诱导的具有被保护为TBDPS醚的末端羟基亚甲基的α,β-不饱和羰基化合物(酮或醛)的环化反应。在高压条件下(11 kbar)用N-苯基马来酰亚胺处理此类呋喃衍生物可生成相应的[4 + 2]加合物,其中内型占主导。然而,在p = 1 atm和T = 20°C时,形成了exo异构体作为主要产物。[4 + 2]加合物在升高的温度和大气压下进行逆狄尔斯-阿尔德反应。