acceleration effect of an allylic hydroxy group on ring-closing enyne metathesis has been found. Ring-closing enyne metathesis of terminalalkynes possessing an allylic hydroxy group proceeded smoothly without the ethylene atmosphere generally necessary to promote the reaction. The synthesis of (+)-isofagomine with the aid of this efficient reaction has been demonstrated. Mechanistic studies of the acceleration
Acceleration effect of allylic hydroxy group on ring-closing enyne metathesis of terminal alkynes: scope and application to the synthesis of isofagomine
substituent effect on ring-closing enyne metathesis has been found. An allylic hydroxy group on enyne substrates accelerates ring-closing enyne metathesis of terminalalkynes. The reaction proceeds smoothly without ethylene atmosphere and/or more reactive newer generation Ru-carbene catalysts, which are generally necessary to promote the reaction. This efficient reaction was applied to the synthesis of
A novel cycloalkylation of 1,6- and 1,7-enynes with stabilized pronucleophiles
作者:Barry M. Trost、Lin Zhi、Katsuharu Imi
DOI:10.1016/s0040-4039(00)76218-6
日期:1994.2
Formation of five and six membered rings simultaneously with addition of a functionalized side chain for further elaboration occurred upon exposing a 1:1 mixture of an enyne and a pronucleophile to a palladium catalyst derived from Pd(OAc)2 and a bidentate ligand.