Stereoselectivity Inversion by Water Addition in the -SO3H-catalyzed Tandem Prins-Ritter Reaction for Synthesis of 4-amidotetrahydropyran Derivatives Full article
Journal |
ChemCatChem
ISSN: 1867-3880 , E-ISSN: 1867-3899 |
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Output data | Year: 2020, Volume: 12, Number: 9, Pages: 2605-2609 Pages count : 5 DOI: 10.1002/cctc.202000070 | ||||||||||
Tags | Prins-Ritter reaction; tetrahydropyran amides; stereoselectivity; sulfonated materials; carbon nanotubes | ||||||||||
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Abstract:
A range of heterogeneous -SO3H functionalized catalysts including carbon and halloysite nanotubes, commercial K10 clay, Amberlyst-15 etc. was investigated for the first time using as a model the Prins-Ritter reaction of (-)-isopulegol with benzaldehyde and acetonitrile producing 4-amido derivatives of octahydro-2H-chromenes (as (S)- and (R)-diastereomers). A strong effect of water addition prior the reaction on the overall selectivity and the ratio of isomers in the case of heterogeneous and homogeneous (p-toluenesulfonic acid) catalysis was found for the first time. The yield of the (R)-diastereomer sharply increased with increasing amount of added water, while the S-isomer prevailed with a minimum amount of added water. Experimental results and DFT calculations clearly indicate a kinetic control for R-amide formation. Typically synthesis of 4-amidooctahydro-2H-chromenes requires subzero temperatures and toxic catalysts, which were avoided in the current work. Nevertheless, the yield of the desired products (up to 83 %) at 30 degrees C after water addition exceeded the values reported previously. Thus, adding water is a simple and a very effective method for controlling both the yield and stereoselectivity of the Prins-Ritter reaction products under mild conditions.
Cite:
Sidorenko A.Y.
, Li-Zhulanov N.S.
, Maki-Arvela P.
, Sandberg T.
, Kravtsova A.V.
, Peixoto A.F.
, Freire C.
, Volcho K.P.
, Salakhutdinov N.F.
, Agabekov V.E.
, Murzin D.Y.
Stereoselectivity Inversion by Water Addition in the -SO3H-catalyzed Tandem Prins-Ritter Reaction for Synthesis of 4-amidotetrahydropyran Derivatives
ChemCatChem. 2020. V.12. N9. P.2605-2609. DOI: 10.1002/cctc.202000070 WOS Scopus РИНЦ
Stereoselectivity Inversion by Water Addition in the -SO3H-catalyzed Tandem Prins-Ritter Reaction for Synthesis of 4-amidotetrahydropyran Derivatives
ChemCatChem. 2020. V.12. N9. P.2605-2609. DOI: 10.1002/cctc.202000070 WOS Scopus РИНЦ
Dates:
Published online: | Mar 27, 2020 |
Published print: | May 7, 2020 |
Identifiers:
Web of science | WOS:000521798700001 |
Scopus | 2-s2.0-85082971905 |
Elibrary | 43259293 |
OpenAlex | W3004745676 |