乙烯基酯和酰胺的烯醇硅烷是 Diels-Alder 反应的经典二烯。在这里,我们报告了它们在 Ir 催化的对映选择性烯丙基取代反应中作为亲核试剂的反应性。各种烯丙基碳酸酯与这些亲核试剂反应,以良好的收率和高对映选择性和出色的支链与线性比率得到烯丙基化产物。这些反应以 KF 或醇盐作为添加剂发生,但机理研究表明这些添加剂不会激活烯醇硅烷。相反,它们用作促进环金属化以生成活性 Ir 催化剂的碱。由烯丙基碳酸酯的氧化加成产生的碳酸根阴离子可能会激活烯醇硅烷以触发它们作为亲核试剂与烯丙基铱亲电试剂反应的活性。
Nickel-Catalyzed Allylation of Allyl Carbonates with Homoallyl Alcohols via Retro-Allylation Providing 1,5-Hexadienes
摘要:
A highly efficient and mild method for the synthesis of 1,5-hexadienes, nickel-catalyzed reactions of Boc-protected allyl alcohols with homoallyl alcohols, has been developed. Nickel-mediated retro-allylation allows for the use of homoallyl alcohols as allylmetal equivalents in the synthesis of 1,5-hexadienes.
Dual Rh(
<scp>II</scp>
)/Pd(0) Relay Catalysis for
<scp>One‐Pot</scp>
Synthesis of
<scp>α‐Quaternary</scp>
Allylated Indolin‐2‐ones and Benzofuran‐2‐ones
作者:Yu Lim Lee、Kyu Ree Lee、Zi Xuan、Sang‐gi Lee
DOI:10.1002/bkcs.12211
日期:2021.3
Cooperative Rh(II) and Pd(0) dual relay catalysis has been developed, which allowed one‐potsynthesis of α‐quaternary allylated indolin‐2‐ones and benzofuran‐2‐ones. The catalytic reaction proceeded through the sequential Rh(II)‐catalyzed intramolecular aromatic C(sp2)‐H bond functionalization of α‐diazo carbonyl compounds, followed by Pd(0)‐catalyzed allylic alkylation with allylic carbonates to afford
carbonates was reported. This reaction, in the presence of chiral CuOAc/SOP and achiral Pd(dppf)Cl2 catalysts, occurs smoothly with high enantioselectivities (up to 97% ee) . The allylboration products, which contain alkene (or diene) unite and alkylboron group, are easily functionalized. The utility of this protocol was demonstrated through the synthesis of an antipsychotic drug, (-)-preclamol.
Palladium-Catalyzed Regio-, Diastereo-, and Enantioselective Allylic Alkylation of Acylsilanes with Monosubstituted Allyl Substrates
作者:Jian-Ping Chen、Chang-Hua Ding、Wei Liu、Xue-Long Hou、Li-Xin Dai
DOI:10.1021/ja106703y
日期:2010.11.10
monosubstituted allyl reagents under Pd-catalyzed asymmetric allylic alkylation reaction conditions to provide products with high regio-, diastereo-, and enantioselectivities. The usefulness of the protocol has been demonstrated by the ready conversion of the allylated products into the corresponding alcohols, esters, and ketones with retention of stereochemistry as well as by the enantioselectivesynthesis of
A simple diamine as ligand in iron-catalyzed regioselective allylic alkylation
作者:Chenguang Yu、Aihua Zhou、Jing He
DOI:10.1039/c2ra21646a
日期:——
A simple and efficient diamine was found to be an efficient ligand for the iron-catalyzedregioselectiveallylicalkylation between various allyl carbonates and nucleophiles, affording excellent yields and good regioselectivity (up to 94% and >20 : 1).
Silver-Assisted, Iridium-Catalyzed Allylation of Bis[(pinacolato)boryl]methane Allows the Synthesis of Enantioenriched Homoallylic Organoboronic Esters
enantioselective approach of making chiral, β-substituted homoallylic organoboronic esters. In the presence of LiOtBu and a catalytic amount of silver salt, commercial bis[(pinacolato)boryl]methane participated in the iridium-catalyzed asymmetric allylation reactions, delivered a “CH2B(pin)” group, and yielded the title compounds from allylic carbonates. The synthetic utility of the prepared chiral
在此描述的是制备手性,β-取代的均烯丙基有机硼酸酯的对映选择性方法。在LiO t Bu和催化量的银盐存在下,商用双[(频哪醇硼烷基)硼]甲烷参加了铱催化的不对称烯丙基化反应,生成了“ CH 2 B(pin)”基团,并获得了标题烯丙基碳酸酯的化合物。制备的手性有机硼酸酯的合成用途通过将其转化为其他重要的化合物类别得到证明。