Nickel-Catalyzed Reductive 1,2-Dialkynylation of Alkenes Bearing an 8-Aminoquinoline Directing Group
摘要:
An unprecedented nickel-catalyzed reductive 1,2-dialkynylation of alkenes bearing an 8-aminoquinoline directing group has been developed. This method proceeded through a migratory insertion/reductive-coupling process under mild conditions with a wide substrate scope and good functional group tolerance, providing direct access to the synthetically flexible 1,5-diynes. Moreover, the 1,2-dialkynylation products could be further converted to borate-ester- or azide-functionalized 1,5-dienes, ditriazole, beta-diyne primary amide, and trisubstituted benzene.
Zirconium-Mediated Multicomponent Reactions of 1,3-Butadiynes with Ylidenemalononitriles to Form Functionalized 1,8-Naphthyridine and Cyclopenta[<i>b</i>]pyridine Derivatives
作者:Shasha Yu、Renhong Sun、Haoyi Chen、Xin Xie、Yuanhong Liu
DOI:10.1002/chem.201405899
日期:2015.1.19
Zirconocene‐mediated multicomponent reactions of 1,3‐butadiynes with ylidenemalononitriles in the absence or presence of CuCl have been developed. In the absence of CuCl, 1,3‐butadiyne couples with three molecules of ylidenemalononitriles to yield azazirconacycles bearing a hexahydro‐1,8‐naphthyridine skeleton with high stereoselectivity. In the presence of CuCl, cyclopenta[b]pyridine or cyclopenta[b]quinolin‐1‐one
在不存在或存在CuCl的情况下,已开发出由茂茂锆介导的1,3-丁二炔与亚甲基丙二腈的多组分反应。在没有CuCl的情况下,1,3-丁二炔与三个分子的亚甲基丙二腈偶合,生成具有六氢-1,8-萘啶骨架且具有高立体选择性的氮杂碳杂环。在氯化亚铜,环戊二烯并[存在b ]吡啶或环戊二烯并[ b ]喹啉-1-酮衍生物通过Zr中的转移金属化获得 C键与Cu C键作为键反应步骤。这些多米诺型反应继续进行具有高化学-选择性,区域选择性和/或立体选择性,并允许多个C形成 N和C C键在单个操作中。
Stereoselective synthesis of enynones via base-catalyzed isomerization of 1,5-disubstituted-2,4-pentadiynyl silyl ethers or their alcohol derivatives
作者:Jingjin Chen、Guoqin Fan、Yuanhong Liu
DOI:10.1039/c0ob00344a
日期:——
1,5-Disubstituted-2,4-pentadiynyl silylethers undergo smooth desilylative isomerization to afford cis-enynones as major products with moderate stereoselectivities in the presence of a catalytic amount of KOtBu or DBU. While the isomerization reactions of their alcohol derivatives catalyzed by KOH, KOtBu or NaH take place efficiently to produce trans-enynones with high stereoselectivities. These reactions
1,5-二取代的2,4-戊二炔基甲硅烷基醚经过顺式脱甲硅烷基化异构化反应,以顺式-乙炔酮为主要产物,并在催化量的二甲基甲酰胺存在下,具有中等的立体选择性。KO Ť卜 或者 DBU。而其醇衍生物的异构化反应是通过酸值, KO Ť卜 或者 碳酸氢钠有效地产生具有高立体选择性的反式-乙炔酮。这些反应为合成具有广泛取代基的烯酮提供了方便实用的途径。
Unexpected Zirconium-Mediated Multicomponent Reactions of Conjugated 1,3-Butadiynes and Monoynes with Acyl Cyanide Derivatives
作者:Shasha Yu、Xu You、Yuanhong Liu
DOI:10.1002/chem.201202607
日期:2012.10.29
Going ber(zirc): Zirconium–butadiyne complexes react with acylcyanidederivatives through diverse reaction pathways. The complexes react with two molecules of carbamoyl cyanide to form 1,4‐benzodiazepin‐2‐one‐derivatives containing azazirconacycles. Reactions with either aroyl cyanides or alkyl cyanoformates lead to azazirconacyclopentenes containing a quaternary carbon center.