The design and synthesis of derivatives of 4-hydroxy-Tamoxifen as potential antagonists of the nuclear receptor LRH-1 are described. Stereoselective McMurry coupling was used to generate the desired internal alkene and a novel method for the synthesis of tetrasubstituted cyclopropane analogues was also developed. (C) 2012 Elsevier Ltd. All rights reserved.
Peroxide promoted tunable decarboxylative alkylation of cinnamic acids to form alkenes or ketones under metal-free conditions
作者:Jing Ji、Ping Liu、Peipei Sun
DOI:10.1039/c5cc01762a
日期:——
In the presence of DTBP or DTBP/TBHP, the decarboxylative alkylation of cinnamic acids with alkanes gave alkenes and ketones respectively via a radical mechanism in moderate to good yields.
prevalent in biologically active compounds and in pharmaceuticals. A ruthenium-catalyzed direct synthesis of β-disubstituted ketones by cross-coupling of two different secondary alcohols is reported. This new protocol was applied to the synthesis of variety of β-disubstituted ketones from various cyclic, acyclic, symmetrical, and unsymmetrical secondary alcohols. An amine–amide metal–ligand cooperation
assimilating to provide the cross-coupled products. Reactions are sensitive to steric hindrance. This new C-C bond forming methodology requires low catalyst load and catalytic amount of base. Notably, the reaction produces H2 and H2O as the only byproducts making the protocol greener, atom economical and environmentally benign.
An assortment of aromatic ketones was successfully functionalized with a variety of unactivated secondary alcohols that serve as alkylating agents, providing β-disubstituted ketone products in good to excellent yields. Remarkably, challenging substrates such as simple acetophenone derivatives are effectively alkylated under this ruthenium catalysis. The substituted cyclohexanol compounds displayed