Chiral alcohol-induced diastereoselective conjugate addition and cyclization
作者:Chenglin Fang、Hiroshi Suemune、Kiyoshi Sakai
DOI:10.1016/s0040-4039(00)97723-2
日期:1990.1
Conjugateaddition of organocuprate reagents to α,β-unsaturated esters of chiral trans-cyclohexanediol proceeded diastereoselectively, and the intramolecular trapping of the generated enolate also afforded asymmetric cyclization products.
Organocatalytic Enantioselective Domino Michael-aldol Condensation of 5-Oxoalkanal and α,β-Unsaturated Aldehydes. Efficient Assembly of Densely Functionalized Cyclohexenes
作者:Bor-Cherng Hong、Roshan Y. Nimje、Amit A. Sadani、Ju-Hsiou Liao
DOI:10.1021/ol8005369
日期:2008.6.1
Organocatalytic Michael reaction of glutaraldehyde and 3-arylpropenal followed by the subsequent intramolecular aldol condensation provided 2-arylcyclohex-3-ene-1,3-dicarbaldehydes. Reactions with the 5-oxohexanal variant afforded the highly functionalized cyclohexenedicarbaldehydes in high diastereoselectivity and high enantioselectivity (>99% ee). Structure of the adduct 3j was confirmed unambiguously
Design, Synthesis, and Application of a <i>C</i><sub>2</sub> Symmetric Chiral Ligand for Enantioselective Conjugate Addition of Organolithium to α,β-Unsaturated Aldimine
作者:Mitsuru Shindo、Kenji Koga、Kiyoshi Tomioka
DOI:10.1021/jo9813181
日期:1998.12.1
A C-2 symmetric chiral diether ligand, (1R,2R)-1,2-dimethoxy-1,2-diphenylethane was designed and synthesized on the basis of the concept of an asymmetric oxygen atom. Mediated by the chiral diether, high enantioselectivities were achieved in conjugate addition of organolithiums to naphthaldehyde imine and cyclic and acyclic alpha,beta-unsaturated aldimines. The absolute configuration of the product is predictable by the model.
Novel strategy of using a C2 symmetric chiral diether in the enantioselective conjugate addition of an organolithium to an .alpha.,.beta.-unsaturated aldimine
作者:Kiyoshi Tomioka、Mitsuru Shindo、Kenji Koga
DOI:10.1021/ja00203a032
日期:1989.10
Enantio- and diastereoselective synthesis of .beta.-substituted cycloalkanecarboxylates