Stereoselective Reactions. XXII. Design and Synthesis of Chiral Chelated Lithium Amides for Enantioselective Reactions.
作者:Ryuichi SHIRAI、Kazumasa AOKI、Daisaku SATO、Hee-Doo KIM、Masatoshi MURAKATA、Tatsuro YASUKATA、Kenji KOGA
DOI:10.1248/cpb.42.690
日期:——
Chiral chelated lithium amides ((R))-1a-g) were designed and synthesized in optically pure forms starting from (R)-phenylglycine.
从(R)-苯甘氨酸开始,设计并合成了手性螯合锂酰胺((R))-1a-g)的光学纯品。
Enantioselective conjugate addition, part V. Synthesis and testing of scalemic tetraamines as chiral cuprate ligands.
作者:Nicole M. Swingle、K.Vasavi Reddy、Bryant E. Rossiter
DOI:10.1016/s0040-4020(01)89378-9
日期:1994.4
Reported herein is the enantioselective conjugate addition of n-butyl to 2-cyclopentenone, 2-cyclohexenone, 2-cycloheptenone and 2-cyclooctenone using scalemic amidocuprates derived from copper(I) iodide, n-butyllithium and a homologous series of 5 scalemic tetraamines referred to as DIMMAP-2 through -6. Cuprates derived from DIMAPP-4 manifest the highest enantioselectivities (up to 78%) and the same
Swingle Nicole M., Reddy K. Vasavi, Rossiter Bryant E., Tetrahedron, 50 (1994) N 15, S 4455-4466
作者:Swingle Nicole M., Reddy K. Vasavi, Rossiter Bryant E.
DOI:——
日期:——
Design, Synthesis, and Application of Chiral Nonracemic Lithium Amide Bases in Enantioselective Deprotonation of Epoxides
作者:Debnath Bhuniya、Arpita DattaGupta、Vinod K. Singh
DOI:10.1021/jo960244v
日期:1996.1.1
The reaction of epoxides with chiral nonracemic lithiumamidebases, designed and prepared from (R)-phenylglycine, has been studied in detail. A maximum of 80% ee was obtained for conversion of cyclohexene oxide to (S)-2-cyclohexen-1-ol. Enantioselective deprotonation of a variety of other epoxides was studied. A cyclopentanoid core unit for prostaglandin synthesis was synthesized in 97% ee.