One-Pot Synthesis of Less Accessible <i>N</i>-Boc-Propargylic Amines through BF<sub>3</sub>-Catalyzed Alkynylation and Allylation Using Boronic Esters
作者:Kento Yasumoto、Taichi Kano、Keiji Maruoka
DOI:10.1021/acs.orglett.9b00931
日期:2019.5.3
amines is described via an alkynylation or allylation of alkynyl-substituted N-Boc-imines. Our strategy relies on the BF3-mediated in situgeneration of alkynyl imines followed by alkynylation or allylation with the corresponding boronic esters. A range of lessaccessible N-Boc-propargylic amines were obtained in moderate to good yields under mild and acidic conditions with higher atom economy compared
Silver-Free Activation of Ligated Gold(I) Chlorides: The Use of [Me<sub>3</sub>NB<sub>12</sub>Cl<sub>11</sub>]<sup>−</sup>as a Weakly Coordinating Anion in Homogeneous Gold Catalysis
作者:Michael Wegener、Florian Huber、Christoph Bolli、Carsten Jenne、Stefan F. Kirsch
DOI:10.1002/chem.201404487
日期:2015.1.12
Phosphane and N‐heterocycliccarbene ligated gold(I) chlorides can be effectively activated by Na[Me3NB12Cl11] (1) under silver‐free conditions. This activation method with a weakly coordinating closo‐dodecaborate anion was shown to be suitable for a large variety of reactions known to be catalyzed by homogeneous gold species, ranging from carbocyclizations to heterocyclizations. Additionally, the
在无银条件下,Na [Me 3 NB 12 Cl 11 ](1)可以有效活化磷化氢和N-杂环卡宾相连的氯化金(I)。这种具有弱配位的活化方法闭合碳-dodecaborate阴离子被证明是适合于大量的各种已知由均匀的金物种催化的反应,从carbocyclizations到heterocyclizations的。此外,还证明了1在以前未知的5-甲硅烷氧基-1,6-炔烃转化中的能力。
A catalytic enantioselective allylation reaction of aldehydes in an aqueous medium
作者:Teck-Peng Loh、Jian-Rong Zhou
DOI:10.1016/s0040-4039(00)00801-7
日期:2000.7
A modified Yamamoto–Yanagisawa's catalyst (S)-Tol-BINAP·AgNO3 was successfully applied to a catalytic enantioselective allylation reaction of aldehydes in an aqueous system. The reactions with aromatic aldehydes afforded the desired products in high yields with good stereoselectivities.
Gold-catalyzed synthesis of 1,3-disubstituted benzenes through tandem allylation/cyclization reaction of alkynals
作者:Sabyasachi Bhunia、Shariar Md. Abu Sohel、Chao-Chin Yang、Shie-Fu Lush、Fwu-Ming Shen、Rai-Shung Liu
DOI:10.1016/j.jorganchem.2008.10.049
日期:2009.2
Treatment of alkynals with 2-substituted allylsilanes and PPh3AuCl/AgOTf (5/3 mol%) catalyst led to formation of 1,3-disubstituted benzenes efficiently. This reaction sequence comprises an initial allylation of aldehyde, followed by cycloisomerization of enynes; PPh3AuOTf is active in both steps.
Access to Highly Functionalized Cyclopentenones via Diastereoselective Pauson–Khand Reaction of Siloxy-Tethered 1,7-Enynes
作者:Austin G. Gallagher、Huan Tian、Osmar A. Torres-Herrera、Shuai Yin、Anxin Xie、Daniel M. Lange、Jerica K. Wilson、Louis G. Mueller、Michael R. Gau、Patrick J. Carroll、Dionicio Martinez-Solorio
DOI:10.1021/acs.orglett.9b03255
日期:2019.11.1
Pauson–Khand reaction (PKR) of siloxy-tethered 1,7-enynes for the synthesis of cyclopentaoxasilinones has been developed. This transformation can be performed on a multigram scale and is characterized by a broad substrate scope, functional group compatibility, and high chemo- and diastereoselectivity. Oxidation of the resulting cyclopentaoxasilinones delivers stereoenriched β-alkylated cyclopentenones, which