提出了羟基膦酸酯和氨基膦酸酯的绝对构型通过与市售萘普生的双衍生作用的分配。周围的立构碳中心的空间排列和Δδ的符号之间的相关性RS通过简单比较(R)-和(S)-萘普生酯或酰胺衍生物的1 H和31 P NMR光谱,可以确定羟基和氨基膦酸酯的绝对构型。NMR研究对结构多样的萘普生酯和羟基膦酸酯和氨基膦酸酯的酰胺进行了广泛的构象分析(理论计算,低温实验),证明了可以成功使用简化的模型。
Stereocontrolled synthesis of hydroxymethylene phosphonate analogues of phosphorylated tyrosine and their conversion to monofluoromethylene phosphonate analogues
A stereocontrolledsynthesis of protected variants 13 and 15 of HPmp 2, a mimic of phosphorylatedtyrosine, was achieved through either chiral-auxiliary assisted or chiral heterobimetal catalyzed stereoselective hydrophosphonylation of 4-formyl-l-phenylalanine derivative 7. Fluorination of HPmp derivatives 13 and 15 thus obtained was carried out to give FPmp derivatives 16 and 17.
effective enantioselective hydrophosphonylation of aldehydes. A variety of aromatic, heteroaromatic, condensed-ring, α,β-unsaturated, and aliphatic aldehydes were found to be suitable substrates for the reaction, and the desired α-hydroxy phosphonate were obtained in good to excellent yields (up to 99%) with moderate to good enantioselectivities (up to 87% ee) under mild conditions (at 0 °C). A possible
A novel manganese/proline-derived catalyst system is reported for the stereoselective synthesis of α-hydroxyphosphonates and α-aminophosphonates. The reaction proceeded smoothly under mild reaction conditions with efficient reaction times. The resulting products were obtained with high yields and good enantioselectivities (up to 83% ee).
Fe(III) catalyzed enantioselective hydrophosphonylation of aldehydes promoted by chiral camphor Schiff bases
作者:Feng Xu、Yanpeng Liu、Jingxuan Tu、Chao Lei、Gaoqiang Li
DOI:10.1016/j.tetasy.2015.07.004
日期:2015.9
Five novel chiral camphor Schiffbases were designed. Schiff base L3 showed high efficiency in Fe(III)-catalyzed asymmetric hydrophosphonylations of aldehydes, giving the corresponding products in high yields (up to 91%) along with moderate to good enantioselectivities (up to 82%).
Synthesis of an unusual dinuclear chiral iron complex and its application in asymmetric hydrophosphorylation of aldehydes
作者:Pandi Muthupandi、Govindasamy Sekar
DOI:10.1039/c2ob25810b
日期:——
An unusual dinuclear chiral iron complex has been synthesized and effectively utilized in the asymmetric hydrophosphorylation of aldehydes to synthesize optically active α-hydroxy phosphonates with excellent yield and good enantioselectivity.