Rhodium-Catalyzed Room Temperature C–C Activation of Cyclopropanol for One-Step Access to Diverse 1,6-Diketones
摘要:
A rhodium-catalyzed room temperature C-C activation of cyclopropanol has been demonstrated for the single-step synthesis of a range of electronically and sterically distinct 1,6-diketones. This reaction proceeds efficiently in shorter reaction time following a highly atom-economical pathway. To illustrate the synthetic potential of 1,6-diketones, aldol and macrocyclization reactions have been successfully demonstrated. Preliminary mechanistic studies revealed the involvement of nonradical pathways.
ProPhenol Derived Ligands to Simultaneously Coordinate a Main‐Group Metal and a Transition Metal: Application to a Zn−Cu Catalyzed Reaction
作者:Barry M. Trost、Guoting Zhang、Minghao Xu、Xiaotian Qi
DOI:10.1002/chem.202104268
日期:2022.2.16
A new bi-functional ligandbearingchiralN-heterocycliccarbene (NHC) and prolinol moieties is designed and applied in the generation of a Cu/Zn hetero-bimetallic complex, which unlocks the asymmetric allylic alkylation reactions of allyl phosphates with zinc keto-homoenolates generated from cyclopropanols, leading to the formation of various γ-vinyl ketones with good regio- and enantio-selectivity
设计了一种新的带有手性 N-杂环卡宾(NHC) 和脯氨醇部分的双功能配体,并应用于生成 Cu/Zn 杂双金属配合物,从而解锁了磷酸烯丙酯与酮基高烯醇锌的不对称烯丙基烷基化反应由环丙醇生成,导致形成具有良好区域选择性和对映选择性的各种 γ-乙烯基酮。DFT 计算支持烯丙基磷酸酯与催化剂的螯合促进了 S N 2' 的添加,并且配体-底物空间相互作用解释了立体选择性结果。
Titanium(IV) Isopropoxide-Catalyzed Formation of 1-Substituted Cyclopropanols in the Reaction of Ethylmagnesium Bromide with Methyl Alkanecarboxylates
作者:Oleg G. Kulinkovich、Sergei V. Sviridov、Dmitry A. Vasilevski
DOI:10.1055/s-1991-26431
日期:——
1-Substituted cyclopropanols 2 are formed in high yields in the titanium(IV)isopropoxide-catalyzed reaction of esters 1 with ethylmagnesium bromide.
在钛(IV)异丙氧化物催化下,酯 1 与溴化乙基镁的反应中,生成高产率的 1-取代环丙醇 2。
Weak Chelation-Assisted C4-Selective Alkylation of Indoles with Cyclopropanols via Sequential C–H/C–C Bond Activation
A Rh-catalyzed weak chelation-guided C4-alkylation of indoles has been accomplished using cyclopropanols as an alkylating agent via the cascade C–H and C–C bond activation. The substrate scope, functional group tolerance, and late-stage mutation of drug molecules are the important practical features.
Site‐ and Stereoselective C(
<i>sp</i>
<sup>3</sup>
)−H Borylation of Strained (Hetero)Cycloalkanols Enabled by Iridium Catalysis
作者:Qian Gao、Senmiao Xu
DOI:10.1002/anie.202218025
日期:2023.2.13
(CBL) and iridium precursor was found effective in catalyzing carbamate-directed C(sp3)−Hborylation of strained (hetero)cycloalkanols in a site- and stereoselective manner. This method features broad substrate scope (>50 examples), excellent site-selectivity, and high enantioselectivity (up to 95 % ee), providing a robust protocol for access to diverse, densely substituted (hetero)cycloalkanols.
Biorelevant Weakly Coordinating Directing Group Assisted C–H Alkenylation with Cyclopropanols via Sequential C–H/C–C Activation
作者:Tripti Paul、Shubhajit Basak、Maniya V. Nanjegowda、Tharmalingam Punniyamurthy
DOI:10.1021/acs.orglett.3c03493
日期:2023.12.22
A weakly coordinating biorelevant intrinsic directing group (DG) assisted site-selective C–H alkenylation viasequential C–H/C–C bond activation has been accomplished under Ru(II)-catalysis using readily accessible cyclopropyl alcohol as an alkenyl surrogate. Utilization of an intrinsic DG, exclusive regioselectivity, functional group diversity, late-stage natural product and drug mutations are the