Stereoselective Synthesis of Quaternary Carbons via the Dianionic Ireland–Claisen Rearrangement
作者:Michael T. Crimmins、John D. Knight、Philip S. Williams、Yan Zhang
DOI:10.1021/ol5008422
日期:2014.5.2
α-methyl-β-hydroxy allylic esters has been developed that proceeds with high diastereoselectivity and provides products containing three contiguous stereogenic carbons, including a quaternary center. The potential utility of the rearrangement for complex molecule synthesis is also demonstrated.
Development of a General, Sequential, Ring-Closing Metathesis/Intramolecular Cross-Coupling Reaction for the Synthesis of Polyunsaturated Macrolactones
作者:Scott E. Denmark、Joseck M. Muhuhi
DOI:10.1021/ja1047363
日期:2010.8.25
macrocyclic lactones containing conjugated Z,Z-1,3-diene subunits is described. The centerpiece of the strategy is a sequential ring-closingmetathesis (RCM) that forms an unsaturated siloxane ring, followed by an intramolecular cross-coupling reaction with a pendant alkenyl iodide. A highly modular assembly of the various precursors allowed the preparation of unsaturated macrolactones containing 11-, 12-
A Regioselective Ru-Catalyzed Alkene−Alkyne Coupling
作者:Barry M. Trost、Michelle Machacek、Matthew J. Schnaderbeck
DOI:10.1021/ol0059504
日期:2000.6.1
[reaction: see text] The reaction of silylalkynes and terminal alkenes proceeds with complete control of regioselectivity by the silyl substituent to give geometrically defined vinylsilanes. Since terminal alkynes normally give mixtures, protodesilylation of these adducts then constitutes a regioselective addition of terminal alkynes to terminal alkenes.
Transfer hydrogenation of cyclic carbonates and polycarbonate to methanol and diols by iron pincer catalysts
作者:Xin Liu、Johannes G. de Vries、Thomas Werner
DOI:10.1039/c9gc02052g
日期:——
as the catalyst for the transfer hydrogenation of cycliccarbonates to methanol and diols. The advantage of this method is the use of isopropanol as the hydrogen source, thus avoiding the handling of flammable hydrogen under high pressure. The reaction offers an indirect route for the reduction of CO2 to methanol. In addition, poly(propylenecarbonate) was converted to methanol and propylene glycol
Process for preparing vinyl substituted beta-diketones
申请人:Southard E. Glen
公开号:US20060069288A1
公开(公告)日:2006-03-30
A process for preparing vinyl substituted beta-diketones includes reacting a halogen-containing beta-diketone with an olefin in a reaction zone under Heck coupling reaction conditions in the presence of a catalyst, a base, and an organic phosphine to provide a vinyl substituted beta-diketone product.