作者:Liu Cai、Yu-Liang Pan、Li Chen、Jin-Pei Cheng、Xin Li
DOI:10.1039/d0cc05855f
日期:——
An efficient asymmetric allylation reaction of allylboronates with seven-membered cyclic imines, dibenzo[b,f][1,4]oxazepines, is described. The reaction, which is catalyzed by a Bi(OAc)3/CPA system, gives a range of chiral nitrogen-containing heterocycle structures in high yields and with good enantioselectivities. The conversion of these products to nitrogen-containing heterocycles is also demonstrated
selected cyclopropanes as model substrates since they present a relatively weak σ-bond. Herein, we describe an iridium-catalyzed hydroboration of cyclopropanes, resulting in β-methyl alkylboronates. These unusually branched boronates can be derivatized by oxidation or cross-coupling chemistry, accessing "designer" products that are desired by practitioners of natural product synthesis and medicinal chemistry
Copper-Catalyzed Enantioselective Allyl-Allyl Coupling between Allylic Boronates and Phosphates with a Phenol/N-Heterocyclic Carbene Chiral Ligand
作者:Yuto Yasuda、Hirohisa Ohmiya、Masaya Sawamura
DOI:10.1002/anie.201605125
日期:2016.8.26
Copper‐catalyzedenantioselective allyl–allyl coupling between allylboronates and either Z‐acyclic or cyclic allylic phosphates using a new chiral N‐heterocycliccarbene ligand, bearing a phenolic hydroxy, is reported. This reaction occurs with exceptional SN2′‐type regioselectivities and high enantioselectivities to deliver chiral 1,5‐diene derivatives with a tertiary stereogenic center at the allylic/homoallylic
据报道,使用新的带有酚羟基的手性N-杂环卡宾配体,在烯丙基硼酸酯与Z-无环或环状烯丙基磷酸酯之间进行铜催化的对映选择性烯丙基-烯丙基偶联。该反应具有异常的S N 2'型区域选择性和高对映选择性,可在手性/均烯丙基位置以手性立体中心生成手性1,5-二烯衍生物。
Copper-Catalyzed Enantioselective Coupling between Allylboronates and Phosphates Using a Phenol–Carbene Chiral Ligand: Asymmetric Synthesis of Chiral Branched 1,5-Dienes
作者:Hirohisa Ohmiya、Masaya Sawamura、Yuto Yasuda
DOI:10.1055/s-0036-1591548
日期:2018.6
phenol–NHC ligand for enantioselective copper catalysis with organoboron compounds is demonstrated and enantiodiscrimination models are discussed. Details of the Cu-catalyzed enantioselective allyl–allyl coupling reaction between allylboronates and (Z)-allylic phosphates using a new chiral N-heterocycliccarbene (NHC) ligand containing a phenolic hydroxy group are presented. The copper catalysis delivers enantioenriched
A good all‐rounder: The copper‐catalyzed conjugate allylation of electron‐deficient alkynes with allylboronates produced hydroallylation products in high yields with perfect regio‐ and stereoselectivity. This method can be applied to alkynes with activating groups such as ester, nitrile, amide, and sulfone substituents (see scheme).