Iodine-catalyzed Transformation of Aryl-substituted Alcohols Under Solvent-free and Highly Concentrated Reaction Conditions
作者:Marjan Jereb、Dejan Vražič
DOI:10.17344/acsi.2017.3841
日期:2017.12.15
transformations of alcohols under solvent-free reaction conditions (SFRC) and under highly concentrated reaction conditions (HCRC) in the presence of various solvents were studied in order to gain insight into the behavior of the reaction intermediates under these conditions. Dimerization, dehydration and substitution were the three types of transformations observed with benzylic alcohols. Dimerization
Introducing Deep Eutectic Solvents to Polar Organometallic Chemistry: Chemoselective Addition of Organolithium and Grignard Reagents to Ketones in Air
作者:Cristian Vidal、Joaquín García-Álvarez、Alberto Hernán-Gómez、Alan R. Kennedy、Eva Hevia
DOI:10.1002/anie.201400889
日期:2014.6.2
Despite their enormous synthetic relevance, the use of polar organolithium and Grignardreagents is greatly limited by their requirements of low temperatures in order to control their reactivity as well as the need of dry organic solvents and inert atmosphere protocols to avoid their fast decomposition. Breaking new ground on the applications of these commodity organometallics in synthesis under more
additions to organic carbonyls. Aryl additions of AlArEt2(THF) to aldehydescatalyzed by the titanium(IV) complex of (R)-H8−BINOL were efficient with a short reaction time of 1 h, affording aryl addition products as exclusive or main products in high yields and excellent enantioselectivities of up to 98% ee. Although ethyl additions to aldehydes occurred in minor extent, this study demonstrates that increasing
一系列AlArEt 2(THF)(Ar = Ph(1a),4-MeC 6 H 4(1b),4-MeOC 6 H 4(1c),4-Me 3 SiC 6 H 4(1d),2-由AlEt 2 Br(THF)与ArMgBr的反应合成萘基(1e)。在CDCl 3溶液中,1 H NMR光谱表明,AlArEt 2(THF)化合物以AlAr x Et 3- x(THF)(x= 0、1、2或3)。发现AlArEt 2(THF)化合物是不对称芳基加成到有机羰基化合物中的优良化合物,并且是原子经济的试剂。由(R)-H 8 -BINOL的钛(IV)络合物催化的AlArEt 2(THF)芳基加成醛的反应效率高,反应时间短至1 h,从而以高收率提供芳基加成产物作为独家产物或主要产物以及高达98%ee的优异对映选择性。尽管乙醛中乙醛的添加量很小,但这项研究表明,增加AlArEt 2的含量(THF)从1.2到1.4或到1
Iron-Catalyzed C(sp<sup>3</sup>)C(sp<sup>3</sup>) Bond Formation through C(sp<sup>3</sup>)H Functionalization: A Cross-Coupling Reaction of Alcohols with Alkenes
作者:Shu-Yu Zhang、Yong-Qiang Tu、Chun-An Fan、Fu-Min Zhang、Lei Shi
DOI:10.1002/anie.200903960
日期:2009.11.2
Synthetic convenience: A wide range of substrates proved to be well tolerated by the novel title transformation. This protocol provides an economical and convenient strategy for the efficient access to structurally diverse secondary alcohols (see scheme).
A New Aspect of Magnesium Bromide‐Promoted Enantioselective Aryl Additions of Triaryl(tetrahydrofuran)aluminum to Ketones Catalyzed by a Titanium(IV) Catalyst of<i>trans</i>‐1,2‐Bis(hydroxycamphorsulfonylamino)cyclohexane
作者:Chien‐An Chen、Kuo‐Hui Wu、Han‐Mou Gau
DOI:10.1002/adsc.200800169
日期:2008.7.7
A novel aspect of MgBr2-promoted asymmetric triarylaluminum-tetrahydrofuran [AlAr3(THF)] additions to ketonescatalyzed by a titanium catalyst of 20 mol% trans-1,2-bis(hydroxycamphorsulfonylamino)cyclohexane (2) is reported. The catalytic system works excellently for aromatic ketones with either an electron-withdrawing or an electron-donating substituent on the aromatic ring at the 2′-, 3′-, or 4′-positions
报道了由MgBr 2促进的不对称三芳基铝-四氢呋喃[AlAr 3(THF)]加成在由20摩尔%的反式-1,2-双(羟基樟脑磺酰基氨基)环己烷(2)钛催化剂催化的酮中的新变化。催化体系对芳族酮具有出色的作用,该芳族酮在2'-,3'-或4'-位的芳香环上具有吸电子或供电子取代基,可提供≥90%的优异对映选择性的叔醇ee,除了在2'-甲氧基苯乙酮中添加苯基和在乙炔酮中添加4-三甲基甲硅烷基苯基(4-TMSC 6 H 4)的情况。