W(CO)5(L)-Catalyzed Cyclization of α-Alkynyl-β-dicarbonyl Derivatives: Synthesis of Methylenelactones, Furans, and Methylenecyclopentanes
摘要:
W(CO)(5)(L)-Catalyzed cyclization of alpha-alkynyl-beta-keto acids, keto esters, and diketones provides methylenelactones, furans, and methylenecyclopentanes via 5-exo-dig cyclization. Also, the present approach can be further applied to 5-endo-dig cyclization.
Targeting the Hsp90 Chaperone: Synthesis of Novel Resorcylic Acid Macrolactone Inhibitors of Hsp90
作者:James E. H. Day、Swee Y. Sharp、Martin G. Rowlands、Wynne Aherne、Paul Workman、Christopher J. Moody
DOI:10.1002/chem.200902766
日期:——
A series of benzo‐macrolactones has been prepared by chemical synthesis, and evaluated as inhibitors of heat shock protein 90 (Hsp90), an emerging attractive target for novel cancer therapeutic agents. A new synthesis of these resorcylic acidmacrolactone analogues of the natural product radicicol is described in which the key steps are the acylation and ring opening of a homophthalic anhydride to
W(CO)5(L)-Catalyzed Cyclization of α-Alkynyl-β-dicarbonyl Derivatives: Synthesis of Methylenelactones, Furans, and Methylenecyclopentanes
作者:Sunggak Kim、Xiangjian Meng
DOI:10.1055/s-0032-1316536
日期:2012.8
W(CO)(5)(L)-Catalyzed cyclization of alpha-alkynyl-beta-keto acids, keto esters, and diketones provides methylenelactones, furans, and methylenecyclopentanes via 5-exo-dig cyclization. Also, the present approach can be further applied to 5-endo-dig cyclization.
Tandem Cyclization–Michael Reaction by Combination of Metal- and Organocatalysis
作者:José Alemán、Virginia del Solar、Cecilia Martín-Santos、Leticia Cubo、Carmen Navarro Ranninger
DOI:10.1021/jo2013077
日期:2011.9.2
The use of a catalytic amount of platinum complexes (1 mol %) was found to be compatible with different organocatalysts (DABCO or the Jørgensen–Hayashi catalyst) that were used in the functionalization of various activated methylenes. By this method, a series of lactones with C-3 quaternary centers and substitution at C-5 were prepared.