3. leads to amide products which can be hydrolyzed under mild conditions. The amidation reaction is mild, general and compatible with both primary C−H bonds of tertiary and secondary alcohols, as well as secondary C−H bonds of cyclic secondary alcohols. This method provides an easy access to free 1,2-aminoalcohols after efficient and mild cleavage of the oxime directing group and activated amide.
Chemoselective Continuous Ru-Catalyzed Hydrogen-Transfer Oppenauer-Type Oxidation of Secondary Alcohols
作者:Ricardo Labes、Claudio Battilocchio、Carlos Mateos、Graham R. Cumming、Oscar de Frutos、Juan A. Rincón、Kellie Binder、Steven V. Ley
DOI:10.1021/acs.oprd.7b00190
日期:2017.9.15
A continuous flow method for the selectiveoxidation of secondary alcohols is reported. The method is based on an Oppenauer-type ruthenium-catalyzed hydrogen-transfer process that uses acetone as both solvent and oxidant. The process utilizes a low loading (1 mol%) of the commercially available ruthenium catalyst [Ru(p-cymene)Cl2]2 and triethylamine as a base and can be successfully applied to a range
Tuning lipase-catalysed kinetic resolution of 2-substituted thiophenes and furans: A scalable chemoenzymatic route to masked γ-bis-oxo-alcohols
作者:Dartagnan S.P. Ferreira、Jeiely G. Ferreira、Everaldo F.S. Filho、Jefferson L. Princival
DOI:10.1016/j.molcatb.2016.01.014
日期:2016.4
most of the chemically synthesized compounds are produced as racemates their kineticresolution has been of great interest. For this purpose a number of chemo-enzymatic approaches were proposed. One of such approaches, the use of isolated lipases, is a well-established alternative. Herein we report the kineticresolutions of 2-Substituted five-membered heteroaromatic rings. By optimizing the reaction
Process for the preparation of thieno-pyridine derivatives
申请人:Parcor
公开号:US04127580A1
公开(公告)日:1978-11-28
This invention relates to a process for the preparation of thieno-pyridine derivatives having the structural formula: ##STR1## in which R.sub.1 represents an optionally substituted alkyl, aryl or aralkyl radical, and R.sub.2 and R.sub.3 represnt each hydrogen or a lower alkyl, aryl or heterocyclic radical, comprising: (a) reacting a derivative of the formula ##STR2## in which R.sub.2 and R.sub.3 are as defined for formula (I) and X represents hydrogen, or an alkali metal, or a radical Mg-Y in which Y represents halogen, with a halo-sulfonyl derivative having the formula: Hal--SO.sub.2 --R.sub.4 (III) in which Hal represents halogen and R.sub.4 represents an optionally substituted alkyl, aryl or aralkyl group, to give a compound having the formula: ##STR3## (b) subsequently reacting the latter compound with an amine of the formula: R.sub.1 --NH.sub.2 (V) in which R.sub.1 is as defined for the formula (I), to give a compound having the formula: ##STR4## and (c) subsequently cyclizing compound (VI) with formaldehyde to give the derivative of the formula (I).
A highly chemo- and regioselective Friedel–Craftsalkylation reaction of furans and thiophenes has been developed, which relies on the activation from the remote conjugated Mukaiyama silyl enol ether motif. Excellent enantioslectivity is generally obtained in reactions with α,β-unsaturated aldehydes under the well-established iminium ion catalysis of a chiral secondary amine.