additive complex 1 could effectively catalyze the C(sp3)–C(sp) coupling of nonactivated alkyl chlorides with alkynes undermildconditions (50 °C) with low catalyst loading (1 mol %). Complex 1 is easy to synthesize and has efficient catalytic activity, especially for alkyl chlorides, undermildconditions.
分别具有[P,S]和[P,Se]双齿配体的两种氯化镍1和2被合成并用作Sonogashira偶联反应的催化剂。既1和2是用于薗头C(SP高效催化剂3)-C(SP)偶联反应。配合物1比配合物2具有更好的催化活性。在 1 mol % 催化剂负载量1和 CuI/Cs 2 CO 3 的组合中/DMSO 在 25 °C 下用于烷基碘与末端炔烃的偶联反应,以中等至优异的产率获得相应的偶联产物。该催化体系也适用于 40 °C 的烷基溴。必须指出的是,以 NaI 作为添加剂配合物1可以在温和条件 (50 °C) 和低催化剂负载量 (1 mol %) 下有效催化未活化的烷基氯化物与炔烃的 C(SP 3 )–C(SP) 偶联)。配合物1易于合成,在温和条件下具有高效的催化活性,特别是对烷基氯化物。
enantioselective method for the synthesis of P‐chiral compounds from easily accessible diaryl phosphinamides is presented. The use of rhodium(III) complexes equipped with a suitable atropochiral cyclopentadienyl ligand is shown to enable an enantiodetermining C−Hactivation step. Upon trapping with alkynes, a broad variety of cyclic phosphinamides with a stereogenic phosphorus(V) atom are formed in high
NOVEL WATER-SOLUBLE COMPLEXING AGENTS AND CORRESPONDING LANTHANIDE COMPLEXES
申请人:CISBIO BIOASSAYS
公开号:US20150361116A1
公开(公告)日:2015-12-17
The invention relates to complexing agents of formula (I):
in which A, chrom1, chrom2 and chrom3 are as defined in the description. The invention also relates to the lanthanide complexes obtained from these complexing agents.
Formal Lossen Rearrangement/Alkenylation or Annulation Cascade of Heterole Carboxamides with Alkynes Catalyzed by CpRh
<sup>III</sup>
Complexes with Pendant Amides
作者:Takayuki Yamada、Yu Shibata、Ken Tanaka
DOI:10.1002/chem.201904156
日期:2019.12.13
It has been established that a cyclopentadienyl (Cp) RhIII complex with two aryl groups and a pendant amide moiety catalyzes the formal Lossen rearrangement/alkenylation cascade of N-pivaloyl heterole carboxamides with internal alkynes, leading to alkenylheteroles. Interestingly, the use of sterically demanding internal alkynes afforded not the alkenylation but the [3+2] annulation products ([5,5]-fused
comprehensive mechanistic studies indicate that a free carbyne radical intermediate is formed via the photocatalyticsingleelectrontransfer process, and KH2PO4 plays a crucial role in significant improvements on yield and selectivity based on density-functional theory calculations, providing a new direction for radical coupling reactions of diazo compounds.
我们报告了使用 α-重氮三氟甲磺酸锍和水聚合合成 1,4-二羰基Z-烯烃形成炔烃的一般方案。C=O、C=C 和 C-H 键是在温和条件下形成的,具有广泛的官能团耐受性。该反应表现出优异的Z选择性和完全的区域选择性。得到的 1,4-二羰基Z-烯烃可以顺利进行后续转化为各种杂芳族支架。此外,该反应还通过直接使用 D 2提供了一种容易获得相应的氘代Z烯烃和氘代杂芳烃的方法,这些氘代具有高水平的氘掺入(90-97% D-inc.)。O,从而使该方法具有很高的价值。综合机理研究表明,通过光催化单电子转移过程形成了游离的碳炔自由基中间体,基于密度泛函理论计算, KH 2 PO 4在显着提高产率和选择性方面发挥了关键作用,为光催化单电子转移过程提供了新的方向。重氮化合物的自由基偶联反应。