Highly Enantioselective Fluorination of Unprotected 3-Substituted Oxindoles: One-Step Synthesis of BMS 204352 (MaxiPost)
摘要:
The catalytic enantioselective fluorination of N-H-free 3-substituted oxindoles was accomplished by a Sc(III)/N,N'-dioxide complex. Under mild reaction conditions, a series of 3-aryl- and 3-alkyl-3-fluoro-2-oxindoles were obtained in excellent yields (up to 98%) and enantioselectivities (up to 99% ee) by using N-fluorobisbenzenesulfonimide (NFSI) as the fluorination agent. MaxiPost was synthesized efficiently in 81% yield with 96% ee.
C-3 alkylation of oxindole with alcohols by Pt/CeO<sub>2</sub> catalyst in additive-free conditions
作者:Chandan Chaudhari、S. M. A. Hakim Siddiki、Kenichi Kon、Atsuko Tomita、Yutaka Tai、Ken-ichi Shimizu
DOI:10.1039/c3cy00911d
日期:——
In a series of transition metal-loaded CeO2 catalysts and Pt-loaded catalysts on various supports, Pt-loaded CeO2 shows the highest activity for the selectiveC-3alkylation of oxindole with octanol. The catalyst is effective for alkylation of oxindole and N-substituted oxindole with a series of substituted benzyl, linear, hetero-aryl alcohols under additive-free conditions and is recyclable. Our results
Pd/C-Catalyzed Alkylation of Heterocyclic Nucleophiles with Alcohols through the “Borrowing Hydrogen” Process
作者:Anggi Eka Putra、Yohei Oe、Tetsuo Ohta
DOI:10.1002/ejoc.201501030
日期:2015.12
The alkylation of heterocyclic compounds is important for the synthesis of various biologically active compounds. In this paper, we present the development of a Pd/C-catalyzedalkylation of heterocyclic compounds using alcohols as the alkylating agents. This method gives the corresponding alkylated heterocyclic compounds in high yields (up to 99 %). The commercially available catalyst can be recovered
Iron‐Catalyzed Cross‐Dehydrogenative Coupling of Oxindoles with Thiols/Selenols for Direct C(
<i>sp</i>
<sup>
<i>3</i>
</sup>
)−S/Se Bond Formation
作者:Lu‐Shan Huang、Dong‐Yang Han、Da‐Zhen Xu
DOI:10.1002/adsc.201900400
日期:2019.9.3
The C−X (S/Se) bonds are common and ubiquitous in natural products and pharmaceuticals. Here, we report an iron‐catalyzedcross‐dehydrogenativecoupling (CDC) reaction for the direct synthesis of C(sp3)−X (S/Se) bonds from oxindoles, phenylacetamides, pyrazolones, phenylacetonitriles and ethyl cyanoacetate with thiols and selenols. All the reactions were performed under simple and mild conditions,
The umpolung alkylation of silyl enol ethers with an iodonium(III) ylide proceeds under mild conditions to afford various 1,4-dicarbonyl compounds in high yields in the presence of a halogen-bonding catalyst. Unlike typical transition-metal activation processes of such ylideprecursors, which tend to proceed via carbenoid intermediates, experimental and computational studies indicate that halogen bonding
Sc takes action: The highly enantioselectivehydroxyaminationreaction of N‐unprotected 2‐oxindoles with nitrosoarenes has been realized using the Sc(OTf)3/L1 complex. The catalyst system exhibited remarkably broad substrate scope and high efficiency. This transformation is the first example of a chiral ScIII/enolate activating a nitrosoarene, and can be conducted on a gram scale without loss in the
Sc发挥作用:使用Sc(OTf)3 / L1络合物实现了N-未保护的2-氧吲哚与亚硝基芳烃的高度对映选择性羟基胺化反应。该催化剂体系表现出显着的底物范围和高效率。该转化是手性Sc III /烯酸酯活化亚硝基芳烃的第一个实例,并且可以以克级进行,而不会损失ee 值。