Yen-Ho Chu and co-workers at the National Chung Cheng University in Taiwan have published in Organic Letters on a synthesis of luotonin. This compound has in vitro activity against murine leukemia P-388 cell line with an IC50 value of 6.3 micromolar.
Jin-Heng Li and co-workers from Hunan Normal University have published in Synthesis on a Conia-ene reaction using Yb and Zn. This reaction is catalytic in zinc but stoichiometric in ytterbium. When a terminal alkyne is used, the cyclization is in the exo-dig mode, but when an internal alkyne is used, the cyclization is in the endo-dig mode.
Takeo Konakahara and co-workers at the Tokyo University of Science have reported in the European Journal of Organic Chemistry on a multicomponent approach to synthesize aza dienes and followed by a ytterbium catalyzed [4+2] reaction between the azadiene and TMS-cyanide.
Marek Chmielewski and co-workers at the Institute of Organic Chemistry of the Polish Academy of Sciences have recently reported in Tetrahedron on some intramolecular cyclization reactions generating an acyliminium ion in the presence of either a propargyl, allyl, or vinyl silane.