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
报道了通过Ni(CO)4促进的炔-烯丙基卤化物环化-羰基化来不对称合成环戊烯酮的不同方法。乙炔亚砜1的使用已证明对合成无环,稠合[5 + 8]和螺[5 + 5],[5 + 7]和[5 + 8]环戊烯有效,而芳基亚砜的放置烯丙基体系上的环糊精无法提供任何环加合物。通过这种方法已经获得了手性稠合的[5 + 8],螺[5 + 7]和[5 + 8]环戊烯酮。最后,当在我们的反应体系中使用不同的同手性α-取代的羧酸盐作为配体时,观察到适度的对映选择性。