Rhodium(III)-Catalyzed C-H Activation Mediated Synthesis of Isoquinolones from Amides and Cyclopropenes
摘要:
We have developed a synthesis of 4-substituted isoquinolones from the rhodium(III)-catalyzed, C-H activation mediated coupling of O-pivaloyl benzhydroxamic acids and 3,3-disubstituted cyclopropenes. Experiments suggest the formation of a [4.1.0]bicyclic system, which can open under acidic conditions to generate the desired isoquinolone.
Rh(III)催化级联环化通过C–H活化获得Iindindolo [2,1 - b ] isoquinolin -5(7 H)-ones:Rosettacin的合成
摘要:
从N-(新戊酰氧基)苯甲酰胺与2-炔基醛的反应中合成了一个有效的协议,用于合成不同取代的7-羟基异吲哚并[2,1- b ]异喹啉-5(7 H)-,该过程通过依次进行炔烃插入,然后将酰胺氮加到醛上。这种方法为产品提供了具有动物功能的产品,以作为进一步多样化的手段。该策略的合成实用性通过生物碱,罗塞他星和拓扑异构酶I抑制剂的简明,两步合成得以成功说明。
Ligand design for Rh(<scp>iii</scp>)-catalyzed C–H activation: an unsymmetrical cyclopentadienyl group enables a regioselective synthesis of dihydroisoquinolones
作者:Todd K. Hyster、Derek M. Dalton、Tomislav Rovis
DOI:10.1039/c4sc02590c
日期:——
A modified cyclopentadienyl ligand greatly improves regioselectivity in Rh(iii) catalyzed alkene insertion/C–H activation.
Heptamethylindenyl (Ind*) enables diastereoselective benzamidation of cyclopropenes via Rh(<scp>iii</scp>)-catalyzed C–H activation
作者:Natthawat Semakul、Kelvin E. Jackson、Robert S. Paton、Tomislav Rovis
DOI:10.1039/c6sc02587k
日期:——
arylhydroxamates and cyclopropenes mediated by Rh(III) catalysis was successfully developed. Through ligand development, the diastereoselectivity of this reaction was improved using a heptamethylindenyl (Ind*) ligand, which has been rationalized using quantum chemical calculations. In addition, the nature of the O-substituted ester of benzhydroxamic acid proved important for high diastereoselectivity
成功开发了Rh( III )催化介导的O-取代芳基异羟肟酸酯与环丙烯的非对映选择性偶联。通过配体开发,使用七甲基茚基 (Ind*) 配体改善了该反应的非对映选择性,并通过量子化学计算对其进行了合理化。此外,苯甲基异羟肟酸的O-取代酯的性质被证明对于高非对映选择性很重要。这种转化可以耐受多种苯甲酰胺和环丙烯,从而为环丙二氢异喹诺酮提供高度非对映控制,然后可以轻松地将其转化为药物和生物活性分子的合成有用的结构单元。
A Coupling of Benzamides and Donor/Acceptor Diazo Compounds To Form γ-Lactams via Rh(III)-Catalyzed C–H Activation
作者:Todd K. Hyster、Kyle E. Ruhl、Tomislav Rovis
DOI:10.1021/ja402274g
日期:2013.4.10
The coupling of O-pivaloyl benzhydroxamic acids with donor/acceptor diazo compounds provides isoindolones in high yield. The reaction tolerates a broad range of benzhydroxamic acids and diazo compounds, including substituted 2,2,2-trifluorodiazoethanes. Mechanistic experiments suggested that C-H activation is turnover-limiting and irreversible and that insertion of the diazo compound favors electron-deficient substrates.