Catalytic arylative cyclization of alkynals has been developed by the use of phosphine-free rhodium/dienecomplexes as catalysts. An asymmetric variant of this process has been successfully realized by employing a C2-symmetric chiral bicyclo[2.2.2]octadiene ligand. The rhodium/dienecatalyst system is also effective for arylative cyclization of other substrates such as alkynones and enynes, achieving multiple
Zirconium-Mediated Intramolecular Cyclization of Yne-Imine
作者:Miwako Mori、Muneyoshi Makabe、Yoshihiro Sato
DOI:10.1055/s-2004-822398
日期:——
cyclopentane derivative was obtained in high yield. The intermediary azazirconacycle was treated with D 3 O + , I 2 or t-BuNC to give the desired deuterated, iodinated or formylated product, respectively, at the vinyl position in good yield. Transmetalation of zirconacycle to CuCl was carried out and then allyl chloride was added to give an allylated compound in good yield. Selective bond fission of