Catalytic Enantioselective Synthesis of Flavanones and Chromanones
摘要:
The enantioselective synthesis of flavanones and chromanones is described. Bifunctional thiourea catalysts promote an asymmetric oxo-conjugate addition to a beta-ketoester alkylidene in high yields with excellent enantioselectivity (80-94% ee) for aryl and alkyl substrates. Decarboxylation of the beta-ketoester proceeds smoothly in a one-pot procedure to afford the enantioenriched flavanones and chromanones.
Catalytic enantioselective synthesis of flavanones and chromanones
申请人:Scheidt Karl
公开号:US20090259055A1
公开(公告)日:2009-10-15
Various chromanone, flavanone and abyssinone compounds as can be prepared enantioselectively using a chiral thiourea catalyst.
可以使用手性硫脲催化剂对各种色酮、黄酮和阿比西农化合物进行对映选择性合成。
Enhanced reactivity and selectivity of asymmetric oxa-Michael addition of 2′-hydroxychalcones in carbon confined spaces
作者:Melad Shaikh、Kiran Kumar Atyam、Mahendra Sahu、Kalluri V. S. Ranganath
DOI:10.1039/c7cc01096f
日期:——
Carbon nanotubes (CNTs) are employed as nanoscale reaction vessels for the asymmetric oxa-Michael addition of 2′-hydroxychalcones.
碳纳米管(CNTs)被用作纳米级反应容器,用于2'-羟基香豆素的不对称氧-迈克尔加成反应。
Asymmetric Synthesis of Sakuranetin-Relevant Flavanones for the Identification of New Chiral Antifungal Leads
作者:Juan Yang、Jixing Lai、Wenlong Kong、Shengkun Li
DOI:10.1021/acs.jafc.1c07557
日期:2022.3.23
Discovery and efficient synthesis of new promising leads have a central role in agrochemical science. Reported herein is the sakuranetin-directed synergistic exploration of an asymmetricsynthesis and an antifungal evaluation of chiral flavanones. A new palladium catalytic system with CarOx-type ligands was successfully identified for the highly enantioselective addition of arylboronic acids to chromones
Cyclometalated Chiral-at-Ruthenium Catalyst for Enantioselective Ring-Closing C(sp<sup>3</sup>)–H Carbene Insertion to Access Chiral Flavanones
作者:Feng Han、Peter H. Choi、Chen-Xi Ye、Yvonne Grell、Xiulan Xie、Sergei I. Ivlev、Shuming Chen、Eric Meggers
DOI:10.1021/acscatal.2c02423
日期:2022.8.19
A competing oxygen attack pathway involving the formation and [1,2]-shift (Stevensrearrangement) of an oxonium ylide intermediate was successfully suppressed in favor of a catalytic enantioselective ring-closing C(sp3)–H carbene insertion. Density functional theory calculations provide a rationale for the observed C–H insertion over the undesirable C–O formation pathway. The method provides access
Asymmetric Intramolecular Oxa-Michael Addition of Activated α,β-Unsaturated Ketones Catalyzed by a Chiral<i>N</i>,<i>N</i>′-Dioxide Nickel(II) Complex: Highly Enantioselective Synthesis of Flavanones