The highly substituted furans (CO2R) (3a-h) are obtained in an one pot reaction of the (η2-thiophosphinito)cobalt complex (OC)2Ph3PCo(η2-SPEt2) (1) with an excess of the acetylene dicarboxylic acid dialkyl esters R1C CR1 (2a-h) (R1 CO2R: R Me (a), Et (b),iPr (c), nPr (d), tBu (e), nBu (f), neoPent (g), Cy (h)) in the presence of HCl. According to an X-ray structural analysis the furan 3g crystallizes
高取代的
呋喃(CO 2 R)(图3a-H )的在(η的一锅反应得到2 -thiopho
SPhinito)
钴络合物(OC)2博士3
PCO(η 2 -
SPEt 2)(1)与过量的
乙炔二
羧酸二烷基酯的R 1 c ^CR 1(图2a-H )(R 1 CO 2 R:R我(一)等(b),我PR(ç),ñ PR(d) ,t Bu(e),n Bu(f),neo Pent(g),Cy(h))在HCl的存在下。根据X射线结构分析,
呋喃3g在Z = 2的三斜空间群P中结晶。3a -h中C6处的质子起源于
氘实验,该
氘实验是在反应情况下进行的在1和2e之间,导致
呋喃4e。与KO吨卜
呋喃3E是在C-6位,并通过[我去质子化3 O] [BF 4 ]它被甲基化,得到化合物5e中。