PtCl2-Catalyzed Tandem Triple Migration Reaction toward (Z)-1,5-Dien-2-yl Esters
摘要:
A novel method for the selective synthesis of (Z)-1,5-dien-2-yl esters has been developed though Pt(II)-catalyzed tandem 1,2-acyl and 1,2-hydride migration, along with an allyl migration reaction of propargylic carboxylates with electronically unbiased internal alkynes. The unusual selectivity of 1,2-acyloxy migration was realized.
Pd-Catalyzed Sequential Reactions via Allene Intermediate for the Synthesis of Polycyclic Frameworks Containing 2,3-Dihydrofuran Units
作者:Ruwei Shen、Xian Huang
DOI:10.1021/ol801139b
日期:2008.8.7
A stepwise process involving Sonogashira coupling, propargyl allenyl isomerization, and consecutive [4 + 2] cyclization has been realized, leading to an efficient synthesis of polycyclic compounds containing a 2,3-dihydrofuran unit. Most attractive for synthetic interest is the finding that up to four stereogenic centers could be generated in one step with high stereoselectivity.