Enantiomerically pure α-pinene derivatives from material of 65% enantiomeric purity. Part 1: Di[3α-(2α-hydroxy)pinane]amine
作者:Stanisław W. Markowicz、Katarzyna Pokrzeptowicz、Janina Karolak-Wojciechowska、Robert Czylkowski、Jan Omelańczuk、Agata Sobczak
DOI:10.1016/s0957-4166(02)00512-8
日期:2002.9
By making use of differences in the physical properties of crystallographically different heteroenantiomeric racemic compounds and pure enantiomers, a convenient method for the preparation of enantiomerically pure 2α-hydroxypinan-3-one and its oxime was developed. The enantiomerically pure compounds were used in syntheses of pinane amino alcohols, which proved to be useful ligands for catalytic applications
通过利用晶体学上不同的对映异构外消旋化合物和纯对映异构体的物理性质差异,开发了一种方便的制备对映体纯的2α-羟基pinan-3-one及其肟的方法。对映体纯的化合物被用于pin烷氨基醇的合成,事实证明它们是催化过程中有用的配体,这些过程用于前手性酮的不对称还原,醛的不对称烷基化和Diels-Alder反应。发现旋光的叔丁基苯基膦硫代酸是一种通用的手性溶剂化剂,用于通过1 H NMR光谱法快速测定上述化合物的对映体过量。
Amino acids and peptides. XXIX. A new efficient asymmetric synthesis of .ALPHA.-amino acid derivatives with recycle of a chiral reagent - asymmetric alkylation of a chiral Schiff base from glycine.
An efficient asymmetric synthesis of D-α-amino acid derivatives (VI) has been achieved by alkylation of the Schiff base (III), prepared from glycine tert-butyl ester and (1S, 2S, 5S)-2-hydroxypinan-3-one (II), followed by hydrolytic cleavage of the alkylated Schiff base (V). The chiral source (II) was also recovered in good yield, allowing the proliferation of the asymmetry according to the cycle of the amino acid asymmetric synthesis shown in Chart 1.