Synthesis of 2-alkyl-2-arylcyanoacetates via CuI/sodium picolinate-catalyzed direct arylation of α-substituted cyanoacetates
作者:Siwei Xie、Peng Qin、Meng Li、Xiaojing Zhang、Yongwen Jiang、Dawei Ma
DOI:10.1016/j.tetlet.2013.05.057
日期:2013.7
CuI/sodium picolinate-catalyzed direct arylation of alpha-substituted cyanoacetates takes place at 60 degrees C in the presence of Cs2CO3 and 4 angstrom molecular sieve, affording 2-alkyl-2-arylcyanoacetates in good to excellent yields. Both electron-rich and electronic-deficient aryl iodides, and some functionalized a-substituted cyanoacetates are compatible with the reaction conditions, thereby allowing diverse synthesis of 2-alkyl-2-arylcyanoacetates. (C) 2013 Elsevier Ltd. All rights reserved.
Ru(II)- and Pt(II)-Catalyzed Cycloisomerization of ω-Aryl-1-alkynes. Generation of Carbocationic Species from Alkynes and Transition Metal Halides and Its Interception by an Aromatic Ring
the cyclization mode is dependent on the length of the tethers. The reaction is limited to substrates containing terminal alkynes. A key step of the reaction is the intramolecular interception by an aromatic ring of the vinylmetal complex 2, which contains a cation center at the beta-position, generated from the electrophilic addition of transition metal halides toward an alkyne. The more electron-rich