The 1,4-addition reaction of organolithiumreagents with 2,6-bis(tert-butyl)-4-methoxyphenyl naphthalenecarboxylates gave regioselectively substituted dihydronaphthalenecarboxylates in high yields. Successive treatment of the esters with organolithiums in THF, lithium triethylborohydride, methyl iodide, and finally sodium borohydride in methanol, provided regio- and stereoselectively the corresponding
Asymmetric addition of aryllithiums to naphthalene bha-esters catalyzed by a chiral ligand
作者:Mitsuru Shindo、Kenji Koga
DOI:10.1016/s0040-4039(00)61651-9
日期:1993.1
In the Presence of both stoichiometric and catalytic amounts of a chiral dieter 1, aryllithiums reacted with BHA-esters of naphthalenecarboxylic acids 2, 5 to afford the corresponding adducts 4, 6 in high ee.
Asymmetric additions to chiral naphthalenes. III. The synthesis of (+)-trans-1,2-disubstituted-1,2-dihydronaphthalenes
作者:A. I. Meyers、Bruce A. Barner
DOI:10.1021/jo00351a034
日期:1986.1
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.
Reductive generation of aldehyde metal enolate from ketene. A one-flask process to 1,1,2- and 1,2,2-trisubstituted dihydronaphthalenes from 1- and 2-naphthalenecarboxylates