Highly Efficient Rhodium Catalysts for the Asymmetric Hydroformylation of Vinyl and Allyl Ethers using<i>C</i><sub>1</sub>-Symmetrical Diphosphite Ligands
作者:Aitor Gual、Cyril Godard、Sergio Castillón、Carmen Claver
DOI:10.1002/adsc.200900608
日期:2010.2.15
Here, we describe the successful application of novel glucofuranose-derived 1,3-diphosphites in the rhodium-catalysed asymmetric hydroformylation of vinyl acetate, 2,5-dihydrofuran and 2,3-dihydrofuran. In the hydroformylation of vinyl acetate, total regioselectivity and high ee (up to 73%) were obtained. When 2,3- and 2,5-dihydrofuran were the substrates, total chemo- and regioselectivities were achieved
在这里,我们描述了新的葡萄糖呋喃糖衍生的1,3-二亚磷酸酯在铑催化的乙酸乙烯酯,2,5-二氢呋喃和2,3-二氢呋喃的不对称加氢甲酰化反应中的成功应用。在乙酸乙烯酯的加氢甲酰化中,获得了总区域选择性和高ee(高达73%)。当以2,3-和2,5-二氢呋喃为底物时,总化学选择性和区域选择性以及ee均达到88%。这些结果对应于迄今为止报道的这些底物的不对称加氢甲酰化中的最高ee值。[RhH(CO)2(L)]种类(L = 15和17)的HP-NMR研究表明,两个配体均与Rh中心配位。eq-eq时尚。复合物[RhH(CO)2(15)]被检测为具有eq-eq配位特征的单一异构体。但是,相应信号的加宽表明该物质在溶液中迅速交换。相反,由于该配体的单环骨架的更大的柔韧性,在低温下以两种构象异构体的混合物形式检测到复合物[RhH(CO)2(17)]。