Efficient Diastereodifferentiating E-Z Photoisomerization of Cyclooctene Tethered to Intramolecular Sensitizer through Optically Active Pentane-2,4-diyl Unit
作者:Francisco Camps、Amadeu Llebaria、Josep Ma Moretó、Lluís Pagès
DOI:10.1016/s0040-4039(00)77687-8
日期:1992.1
The reaction of 1-bromomethyl-1-cycloalkenes and acetylenes in the presence of tetracarbonylnickel affords moderate to good yields of spirocyclopentenones in a regio and stereoselective process.
Asymmetric approaches to cyclopentenones in the Ni(0)-promoted cyclocarbonylation reaction of allyl halides and acetylenes
作者:Juan Manuel Villar、Antonio Delgado、Amadeu Llebaria、Josep M. Moretó、Elies Molins、Carles Miravitlles
DOI:10.1016/0040-4020(96)00573-x
日期:1996.7
Different approaches to the asymmetric synthesis of cyclopentenones by means of the Ni(CO)4-promoted alkyne-allyl halide cyclization-carbonylation are reported. The use of acetylenic sulfoxides 1 has proved effective for the synthesis of acyclic, fused [5+8], and spiro [5+5], [5+7], and [5+8] cyclopentenones, whereas placement of the aryl sulfoxide on the allylic system failed to afford any cycloadduct
group was developed to retard non-catalyzed reactions in bromination using N-bromosuccinimide by capturing in situ-generated bromine (Br2), which was revealed to cause background reactions. The TCO is useful as an additive for improving catalyst-controlled selectivity and as a probe to investigate the involvement of Br2 in catalytic bromination.
Hayward,R.C.; Whitham,G.H., Journal of the Chemical Society. Perkin transactions I, 1975, p. 2267 - 2270
作者:Hayward,R.C.、Whitham,G.H.
DOI:——
日期:——
An approach to homochiral fused and spiro cyclopentenones
作者:Juan Manuel Villar、Antonio Delgado、Amadeu Llebaria、Josep M. Moretó
DOI:10.1016/0957-4166(95)00055-t
日期:1995.3
An asymmetric approach to the Ni(CO)4 induced alkyne-allyl halide cyclization-carbonylation process by the use of homochiral acetylenic sulfoxides to afford enantiopure [5+8] fused and spiro cyclopentenones is reported.