A convenient synthesis of (1S,2R)-1,2-indene oxide and trans-(1S,2S)-2-bromo-1-indanol via oxazaborolidine-catalyzed borane reduction
摘要:
A facile synthesis of (1S,2R)-indene oxide with > 99% e.e. and (1S,2S)-trans-2-bromo-1-indanol with 87% e.e. has been established by employing CBS-oxazaborolidine-catalyzed asymmetric borane reduction of 2-p-toluenesulfonyloxy-1-indanone using N-ethyl-N-isoyropylaniline-borane complex as the borane carrier. (C) 2001 Elsevier Science Ltd. All rights reserved.
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‐Heterocycle‐Substituted Iodoarenes (NHIAs) to Efficient Organocatalysts in Iodine(I/III)‐Mediated Oxidative Transformations
作者:Andreas Boelke、Boris J. Nachtsheim
DOI:10.1002/adsc.201901356
日期:2020.1.7
The reactivity of ortho‐functionalized N‐heterocycle‐substituted iodoarenes (NHIAs) as organocatalysts in iodine(I/III)‐mediated oxidations was systematically investigated in the α‐tosyloxylation of ketones as the model reaction. During a systematic catalyst evolution, it was found that NH‐triazoles and benzoxazoles have the most significant positive influence on the reactivity of the central iodine
Solvent-Free Reactions with Hypervalent Iodine Reagents
作者:Mekhman S. Yusubov、Thomas Wirth
DOI:10.1021/ol047363e
日期:2005.2.1
[reaction: see text] We describe solvent-free reactions for the synthesis of hypervalent iodinereagents and their use in solid-state reactions. Improved yields and higher purities of the products are observed.
The synthesis of a series of 21 novel 3‐alkyl/aryl‐7/9‐methyl‐10,10a‐dihydroindeno[1,2‐e][1,2,4]triazolo[3,4‐b][1,3,4]thiadiazines (4) has been achieved by the cyclocondensation between 4/6‐methyl‐2‐tosyloxy‐1‐indanones (2) and 3‐alkyl/aryl‐4‐amino‐5‐mercapto‐1,2,4‐s‐triazoles (3). 4/6‐Methyl‐2‐tosyloxy‐1‐indanones (2) were readily accessible through hypervalent iodine oxidation of 4/6‐methyl‐1‐indanones
Enantioselective Iodine(III)-Mediated Synthesis of α-Tosyloxy Ketones: Breaking the Selectivity Barrier
作者:Benoit Basdevant、Claude Y. Legault
DOI:10.1021/acs.orglett.5b02501
日期:2015.10.2
levels of enantioselectivity are reported for the synthesis of α-tosyloxy ketones, using enolesters and chiral iodine(III) reagents. The reaction can be performed under both stoichiometric and catalytic conditions. These results suggest widely different reaction mechanisms for the reaction of ketones versus enolesters, supporting recent computational insights.
Catalytic Enantioselective α-Oxysulfonylation of Ketones Mediated by Iodoarenes
作者:Sabine M. Altermann、Robert D. Richardson、T. Keri Page、Ruth K. Schmidt、Edward Holland、Umal Mohammed、Shauna M. Paradine、Andrew N. French、Christine Richter、A. Masih Bahar、Bernhard Witulski、Thomas Wirth
DOI:10.1002/ejoc.200800741
日期:2008.11
alpha-oxysulfonylation of ketones catalysed by enantioenriched iodoarenes using mCPBA as stoichiometric oxidant is reported to give useful synthetic intermediates in good yield and modest enantioselectivity. We believe this to be the first report of an enantioselective organocatalytic reaction involving hypervalent iodine reagents which should open up a new field for enantioselective organocatalysis of oxidation