Asymmetric Cycloisomerization of <i>o</i>
-Alkenyl-<i>N</i>
-Methylanilines to Indolines by Iridium-Catalyzed C(sp<sup>3</sup>
)−H Addition to Carbon-Carbon Double Bonds
diphosphine effectively promotes the intramolecular addition of the C(sp3)−H bond across a carbon–carbon double bond in a highly enantioselective fashion. The reaction gives indolines bearing a quaternary stereogenic carbon center at the 3‐position. The reactionmechanism involves rate‐determining oxidative addition of the N‐methyl C−H bond, followed by intramolecular carboiridation and subsequent reductive
irradiation in the presence of catalytic amounts of [(DPEphos)(bcp)Cu]PF6 and an amine, a range of unactivated aryl and alkyl halides were shown to be smoothly activated through a rare Cu(I)/Cu(I)*/Cu(0) catalytic cycle. This complex efficiently catalyzes a series of radical processes, including reductions, cyclizations, and direct arylation of arenes.
Formation of CCbonds from CO2 is a much sought after reaction in organic synthesis. To date, other than CH carboxylations using stoichiometric amounts of metals, base, or organometallic reagents, little is known about CC bond formation. In fact, to the best of our knowledge no catalyticmethylation of CHbondsusing CO2 and H2 has been reported. Described herein is the combination of CO2 and H2 for efficient
由CO 2形成CC键是有机合成中非常需要的反应。迄今为止,除了使用化学计算量的金属,碱或有机金属试剂进行的CH羧化反应外,对CC键的形成知之甚少。实际上,据我们所知,没有报道使用CO 2和H 2催化CH键的甲基化。本文描述的是CO 2和H 2的组合,用于碳亲核试剂(如吲哚,吡咯和富电子芳烃)的有效甲基化。使用低聚甲醛的对比实验显示出与CO 2相似的反应性/ H 2系统。
Heterocyclic derivatives as modulators of ion channels
申请人:Martinborough Esther
公开号:US20080027067A1
公开(公告)日:2008-01-31
The present invention relates to heterocyclic derivatives useful as inhibitors of ion channels. The invention also provides pharmaceutically acceptable compositions comprising the compounds of the invention and methods of using the compositions in the treatment of various disorders.
Catalytic Aerobic Dehydrogenatin of
<i>N</i>
‐Heterocycles by
<i>N</i>
‐Hydoxyphthalimide
作者:Weidong Chen、Hao Tang、Weilin Wang、Qiang Fu、Junfei Luo
DOI:10.1002/adsc.202000767
日期:2020.9.21
Catalytic methods for the aerobic dehydrogenation of N‐heterocycles are reported. In most cases, indoles are accessed efficiently from indolines using catalytic N‐hydroxyphthalimide (NHPI) as the sole additive under air. Further studies revealed an improved catalytic system of NHPI and copper for the preparation of other heteroaromatics, for example quinolines.