A new convenient variant of the reduction of thymol methyl ether by lithium and isopropanol in the presence of ethylenediamine at 80-85 deg C and a molar equivalent ratio of ether to alcohol to amine to metal of 1:(8-12):(2.5-3):(4-6) has been developed.The proposed method permits the yield of piperitone to be doubled in comparison with known methods.
Sequential Birch reaction and asymmetric Ir-catalyzed hydrogenation as a route to chiral building blocks
A range of 1,2,4-trisubstituted cyclohexadienes obtained from the Birch reaction were hydrogenated asymmetrically to produce synthetically valuable chiral compounds in high enantio- and diastereoselectivity. The Royal Society of Chemistry.
Paptchikhine, Alexander,Itto, Kaori,Andersson, Pher G.
supporting information; experimental part
p. 3989 - 3991
(2011/06/09)
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