131029-01-1Relevant articles and documents
Chemistry and pharmacological evaluation of 1-phenyl-2-propanols and 1-phenyl-2-propanones.
Barfknecht,Smith,Nichols,Leseney,Long,Engelbrecht
, p. 799 - 801 (1971)
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Chemoenzymatic synthesis of enantiomerically pure syn-configured 1-aryl-3-methylisochroman derivatives
Simon, Robert C.,Busto, Eduardo,Richter, Nina,Belaj, Ferdinand,Kroutil, Wolfgang
, p. 111 - 121 (2014)
A two-step synthesis of various enantiomerically pure 1-aryl-3- methylisochroman derivatives was accomplished through asymmetric biocatalytic ketone reduction followed by an oxa-Pictet-Spengler reaction. The compounds were obtained in good to excellent yield (47-92 %) in favor of the syn diastereomers [dr (syn/anti) up to 99:1]. Enantiopure arylpropanols serving as pronucleophiles for the C-C bond-formation step were obtained by biocatalytic reduction by employing enantiocomplementary alcohol dehydrogenases, which gave access to the (S) and (R) enantiomer with up to >99 % conversion and up to >99 % ee. A two-step sequence involving a biocatalytic hydrogen-transfer reduction and a syn-diastereoselective oxa-Pictet-Spengler reaction was established to provide a series of 1-aryl-3-methylchroman derivatives with perfect enantioselectivity; PTSA = para-toluenesulfonic acid. Copyright
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Ichikawa et al.
, p. 3401,3403 (1959)
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Enantioselective Reduction of Ketones and Synthesis of 2-Methyl-2,3-dihydro-1-benzofuran Catalyzed by Chiral Spiroborate Ester
Chopade, A. U.,Chopade, M. U.,Nikalje, M. D.,Patil, H. S.
, p. 611 - 618 (2021/06/02)
Abstract: Asymmetric reduction of homobenzylic ketones was achieved through the use of chiral spiroborate ester catalyst. The catalyst is applicable for both analytical and industrial purposes since it is not sensitive to air and moisture. A rapid synthetic route has been developed for the preparation of (S)-2-methyl-2,3-dihydro-1-benzofuran via enantioselective reduction of homobenzylic ketone in the presence of a chiral spiroborate catalyst as the key step.
Hydroperoxidations of Alkenes using Cobalt Picolinate Catalysts
Peralta-Neel, Zulema,Woerpel
supporting information, p. 5002 - 5006 (2021/06/30)
Hydroperoxides were synthesized in one step from various alkenes using Co(pic)2as the catalyst with molecular oxygen and tetramethyldisiloxane (TMDSO). The hydration product could be obtained using a modified catalyst, Co(3-mepic)2, with molecular oxygen and phenylsilane. Formation of hydroperoxides occurred through a rapid Co-O bond metathesis of a peroxycobalt compound with isopropanol.
A General Regioselective Synthesis of Alcohols by Cobalt-Catalyzed Hydrogenation of Epoxides
Beller, Matthias,Junge, Kathrin,Leischner, Thomas,Li, Wu,Liu, Weiping
supporting information, p. 11321 - 11324 (2020/05/16)
A straightforward methodology for the synthesis of anti-Markovnikov-type alcohols is presented. By using a specific cobalt triphos complex in the presence of Zn(OTf)2 as an additive, the hydrogenation of epoxides proceeds with high yields and selectivities. The described protocol shows a broad substrate scope, including multi-substituted internal and terminal epoxides, as well as a good functional-group tolerance. Various natural-product derivatives, including steroids, terpenoids, and sesquiterpenoids, gave access to the corresponding alcohols in moderate-to-excellent yields.