Gold-Catalyzed Cycloisomerization of 1,7-Enyne Esters to Structurally Diverse <i>cis</i>-1,2,3,6-Tetrahydropyridin-4-yl Ketones
作者:Weidong Rao、Sally、Ming Joo Koh、Philip Wai Hong Chan
DOI:10.1021/jo400121j
日期:2013.4.5
that relies on gold(I)-catalyzed cycloisomerization of 1,7-enyne esters to prepare highly functionalized cis-1,2,3,6-tetrahydropyridin-4-yl ketone derivatives in good to excellent yields and as a single regio-, diastereo-, and enantiomer is described. By taking advantage of the distinctive differences in the electronic and steric properties between an NHC (NHC = N-heterocyclic carbene) and phosphine
一种依靠金(I)催化的1,7-烯炔酯的环异构化反应来制备高官能度的顺式-1,2,3,6-四氢吡啶-4-基酮衍生物的合成方法,产率高至优异,而且单一描述了区域,非对映和对映体。通过利用各自的金(I)配合物中NHC(NHC = N-杂环卡宾)和膦配体之间在电子和空间特性方面的显着差异,可以观察到产物选择性的差异。在[PhCNAuIPr] + SbF 6 –(IPr = 1,3-双(2,6-二异丙基苯基)咪唑-2-ylidine)作为催化剂的情况下,串联1,3-酰氧基迁移/ 6- exo - trig发现底物的环化/ 1,5-酰基迁移选择性发生,得到δ-二酮取代的1,2,3,6-四氢吡啶加合物。相反,发现使用金(I)膦配合物[MeCNAu(JohnPhos)] + SbF 6 –(JohnPhos =(1,1'-联苯-2-基)-二叔丁基膦)进行的反应导致1,7-烯炔酯的优先1,3-酰氧基迁移/ 6-