Catalytic Asymmetric Construction of Spiro(γ-butyrolactam-γ-butyrolactone) Moieties through Sequential Reactions of Cyclic Imino Esters with Morita-Baylis-Hillman Bromides
作者:Huai-Long Teng、He Huang、Chun-Jiang Wang
DOI:10.1002/chem.201201475
日期:2012.10.1
Spiro(γ‐butyrolactam‐γ‐butyrolactone): A route to enantioenriched spiro(γ‐butyrolactam‐γ‐butyrolactone) compounds, a valuable motif for drug discovery, was developed by use of a highly efficient copper(I)/TF‐BiphamPhos‐catalyzed tandem Michael addition–elimination of homoserine lactone derived cycliciminoesters with Morita–Baylis–Hillman (MBH) bromides, followed by treatment with para‐toluenesulfonic
We report in this paper the regioselective synthesis of functionalized oxime ethers 3 in good yields from the reaction of readily available starting material oximes with allyl bromides, derived from Baylis-Hillman adducts, in the presence of sodium hydride and triethyl amine under mild condition.
enynoates are formally oxidized for the annulation while the alkynyl moiety is converted to an alkene. The reaction offers an efficient synthesis of highly functionalized cyclohexenes in moderate to good yields with exclusive regioselectivity and high diastereoselectivityunder mild conditions.
Kinetic resolution in the directed hydrogenation of N-substituted -(aminoalkyl) acrylates, precursors of optically active -amino acids.
作者:John M Brown、Alun P James、Louise M Prior
DOI:10.1016/s0040-4039(00)96075-1
日期:1987.1
One‐Pot Synthesis of α‐Diazo‐γ,δ‐unsaturated Esters as Versatile Building Blocks for Functionalized Dienes, Cyclopentenes, and 5,7‐Fused Bicycles
作者:Theo V. C. Russo、Marcus M. Sá
DOI:10.1002/ejoc.202100797
日期:2021.8.6
The synthesis of novel allylic α-diazo carbonyl compounds was readily achieved through a one-pot strategy involving base-catalyzed allylation of 1,3-dicarbonyls followed by the deacylative diazo transfer reaction. The synthetic versatility of α-diazo esters was demonstrated through rhodium-catalyzed transformations, where the type of product formed (cyclopentene, 5,7-fused bicycle, diene) is dependent