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Zimmer R, Reissig HU, Schefzig L, Kurzawa T, Rancan G, Linder I, Leisering S, Bera MK, Gart M. Access to Highly Substituted Pyrimidine N-Oxides and 4-Acetoxymethyl-Substituted Pyrimidines via the LANCA Three-Component Reaction–Cyclocondensation Sequence. SYNTHESIS-STUTTGART 2021. [DOI: 10.1055/s-0040-1706020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
AbstractThe LANCA three-component reaction of lithiated alkoxyallenes (LA), nitriles (N), and carboxylic acids (CA) smoothly provides β-alkoxy-β-ketoenamides in broad structural variety. The subsequent cyclocondensation of these compounds with hydroxylamine hydrochloride afforded a large library of pyrimidine N-oxides under mild conditions and in good yields. Their synthetic utility was further increased by the Boekelheide rearrangement leading to 4-acetoxymethyl-substituted pyrimidines. With trifluoroacetic anhydride the rearrangement proceeds even at room temperature and directly furnishes 4-hydroxymethyl-substituted pyrimidine derivatives. The key reactions are very robust and work well even in the presence of sterically demanding substituents.
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Affiliation(s)
| | | | - Luise Schefzig
- Institut für Chemie und Biochemie, Freie Universität Berlin
| | - Timon Kurzawa
- Institut für Chemie und Biochemie, Freie Universität Berlin
| | - Giaime Rancan
- Institut für Chemie und Biochemie, Freie Universität Berlin
| | - Igor Linder
- Institut für Chemie und Biochemie, Freie Universität Berlin
| | | | - Mrinal K. Bera
- Institut für Chemie und Biochemie, Freie Universität Berlin
- Department of Chemistry, Indian Institute of Engineering Science and Technology
| | - Max Gart
- Institut für Chemie und Biochemie, Freie Universität Berlin
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