Synthesis of 1,2,3-Trisubstituted Cyclopentannulated Benzothiophenes through an Acid-Mediated, Solvent-Free, One-Pot Domino Process
作者:Bishnupada Satpathi、Seema Dhiman、S. S. V. Ramasastry
DOI:10.1002/ejoc.201400008
日期:2014.4
The synthesis of 1,2,3-trisubstituted cyclopenta[b]thiophenes was achieved through a Bronsted acid mediated dominoprocess under solvent-free conditions. In this one-potprocess, benzothienylation of 1,3-dicarbonyls follows an intramolecular aldol-type reaction leading to the generation of functionalized and highly substituted annulated benzothiophenes. This class of compounds find potential applications
Stereospecific Nickel-Catalyzed Cross-Coupling Reactions of Alkyl Grignard Reagents and Identification of Selective Anti-Breast-Cancer Agents
作者:Ivelina M. Yonova、A. George Johnson、Charlotte A. Osborne、Curtis E. Moore、Naomi S. Morrissette、Elizabeth R. Jarvo
DOI:10.1002/anie.201308666
日期:2014.2.24
Alkyl Grignard reagents that contain β‐hydrogen atoms were used in a stereospecific nickel‐catalyzed cross‐coupling reaction to form C(sp3)C(sp3) bonds. Aryl Grignard reagents were also utilized to synthesize 1,1‐diarylalkanes. Several compounds synthesized by this method exhibited selective inhibition of proliferation of MCF‐7 breast cancer cells.
herein an unprecedented highly efficient Guerbet‐type reaction at room temperature (catalytic TON up to >6000). This β‐alkylation of secondary methyl carbinols with primary alcohols has significant advantage of delivering higher‐order secondary alcohols in an economical, redox‐neutral fashion. In addition, the first enantioselective Guerbet reaction has also been achieved using a commercially available