Using Triethynylphosphine Ligands Bearing Bulky End Caps To Create a Holey Catalytic Environment: Application to Gold(I)-Catalyzed Alkyne Cyclizations
作者:Atsuko Ochida、Hideto Ito、Masaya Sawamura
DOI:10.1021/ja066800c
日期:2006.12.1
and catalytic uses of phosphinoalkynes bearing bulky end caps at the alkyne termini, that is, tris[(triarylsilyl)ethynyl]phosphines are reported. The most salient feature of the new phosphines is the holey molecular shape possessing a deep and large-scale metal-binding cavity. The holey phosphines displayed remarkable rate enhancement in the gold(I)-catalyzedsix- and seven-memberedring forming cyclizations
Linear Hydroaminoalkylation Products from Alkyl‐Substituted Alkenes
作者:Michael Warsitz、Sven Doye
DOI:10.1002/chem.202003223
日期:2020.11.26
alkyl‐substituted alkenes into linear hydroaminoalkylation products represents a strongly desirable synthetic transformation. In particular, such conversions of N‐methylamine derivatives are of great scientific interest, because they would give direct access to important amines with unbranched alkyl chains. Herein, we present a new one‐pot procedure that includes an initial alkenehydroaminoalkylation with an
Iridium-Catalyzed Oxidative Olefination of Furans with Unactivated Alkenes
作者:Christo S. Sevov、John F. Hartwig
DOI:10.1021/ja504414c
日期:2014.7.30
The oxidative coupling of arenes and alkenes is an attractive strategy for the synthesis of vinylarenes, but reactions with unactivatedalkenes have typically occurred in low yield. We report an Ir-catalyzed oxidative coupling of furans with unactivated olefins to generate branched vinylfuran products in high yields and with high selectivities with a second alkene as the hydrogen acceptor. Detailed
芳烃和烯烃的氧化偶联是合成乙烯基芳烃的一种有吸引力的策略,但与未活化烯烃的反应通常以低产率发生。我们报告了呋喃与未活化烯烃的 Ir 催化氧化偶联,以高产率和高选择性生成支链乙烯基呋喃产物,第二个烯烃作为氢受体。详细的机械实验揭示了催化剂分解途径,这些途径通过明智地选择反应条件和应用新配体而得到缓解。
CATALYST FOR CROSS-COUPLING REACTION, AND PROCESS FOR PRODUCTION OF AROMATIC COMPOUND USING THE SAME
申请人:Nakamura Masaharu
公开号:US20110152523A1
公开(公告)日:2011-06-23
The present invention provides a process for efficiently producing an alkylated aromatic compound in good yield, by a cross-coupling reaction between an alkyl halide and an aromatic magnesium reagent. A process for producing an aromatic compound represented by Formula (1):
R—Ar′ (1)
wherein R is a hydrocarbon group, and Ar′ is an aryl group;
the process comprising:
reacting a compound represented by Formula (2):
R—X (2)
wherein X is a halogen atom, and R is as defined above, with a magnesium reagent represented by Formula (3):
Ar′—MgY (3)
wherein Y is a halogen atom, and Ar′ is as defined above, in the presence of a catalyst for cross-coupling reactions comprising an iron compound and a bisphosphine compound represented by Formula (4):
wherein Q is a divalent group derived from an aromatic ring by removing two hydrogen (H) atoms on adjacent carbon atoms; and each Ar is independently an aryl group.