Synthesis of Terminal Allenes via a Copper-Catalyzed Decarboxylative Coupling Reaction of Alkynyl Carboxylic Acids
作者:Jeongah Lim、Jinseop Choi、Han-Sung Kim、In Seon Kim、Kye Chun Nam、Jimin Kim、Sunwoo Lee
DOI:10.1021/acs.joc.5b02361
日期:2016.1.4
Synthesis of terminal allenes via a copper-catalyzeddecarboxylativecoupling reaction was developed. Aryl alkynyl carboxylic acid, paraformaldehyde, and dicyclohexylamine were reacted with CuI (20 mol %) in diglyme at 100 °C for 2 h to produce the terminal allene in moderate to good yields. The method showed good functional group tolerance.
Development of Highly Chemoselective Bulky Zincate Complex,<i>t</i>Bu<sub>4</sub>ZnLi<sub>2</sub>: Design, Structure, and Practical Applications in Small-/Macromolecular Synthesis
We present full details of the unique reactivities of the newly developed dianion-type bulky zincate, dilithium tetra-tert-butylzincate (tBu(4)ZnLi(2)). With this reagent, halogen-zinc exchange reaction of variously functionalized haloaromatics and anionic polymerization of N-isopropylacrylamide (NIPAm)/styrene with excellent chemoselectivity were realized. Halogen-zinc exchange reaction followed by
Suzuki–Miyaura Cross Coupling Reactions of B-Allenyl-9-BBN
作者:Karin Radkowski、Günter Seidel、Alois Fürstner
DOI:10.1246/cl.2011.950
日期:2011.9.5
Despite the tremendously wide scope of the palladium-catalyzedSuzuki–Miyauracrosscoupling, boron-based allenylation reactions of aryl halides are virtually unknown. It is now demonstrated that t...
Palladium‐Catalyzed [6+2] Double Allene Annulation for Benzazocines Synthesis
作者:Haibo Xu、Shengming Ma
DOI:10.1002/anie.202213676
日期:2023.2
A palladium-catalyzed formal [6;2] annulation of allenyl benzoxazinanones with terminal allenes has been developed, forming the challenging 8-membered cycles. Decent yields and excellent regioselectivity have been observed undermildconditions with a remarkable Z-stereoselectivity for the exo-cyclic C=Cbonds.
aliphatic alcohols (also as solvent) allow to produce useful α,β-unsaturatedesters in good to excellent yields at 70 °C. Efficient regioselectivity could be controlled in the presence of N-ligands while the P-ligands had no influence on the conversion of substrates and the chemo/regioselectivity of target products. By involving N-ligand 4,7-dimethyl-1,10-phenanthroline in the catalytic system, α,β-unsaturated