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Zaidlewicz M, Sokól W, Wolan A, Cytarska J, Tafelska-Kaczmarek A, Dzielendziak A, Prewysz-Kwinto A. Enolboration of conjugated ketones and synthesis of beta-amino alcohols and boronated alpha-amino acids. PURE APPL CHEM 2003. [DOI: 10.1351/pac200375091349] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Enolization–aldolization of conjugated ketones, enantioselective synthesis of benzofuryl beta-amino alcohols, and synthesis of p-dihydroxyborylphenylalanine (BPA) and its analogs are described. Aldolization of benzaldehyde with lithium dienolates derived from unhindered conjugated cyclohexenones favored anti- selectivity, whereas syn selectivity was favored for hindered cyclohexenones. Anti-aldols were preferentially formed from dienolborinates derived from conjugated cyklohexenones, however,competing aldolization at the 2-position was observed for hindered ketones. Benzofuryl beta-amino alcohols were prepared using as a key step the enantioselective reduction of the corresponding alpha-bromoacetylbenzofurans with (–)-B- -chlorodiisopinocampheylborane. Ionic liquids were used as solvents for the synthesis of BPA by the Suzuki cross-coupling reaction. The reaction time is short, and a solution of the catalyst in the ionic liquid can be recycled.
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Affiliation(s)
- M. Zaidlewicz
- 1Department of Chemistry, Nicolaus Copernicus University, 87-100 Torun, Poland
| | - W. Sokól
- 1Department of Chemistry, Nicolaus Copernicus University, 87-100 Torun, Poland
| | - A. Wolan
- 1Department of Chemistry, Nicolaus Copernicus University, 87-100 Torun, Poland
| | - J. Cytarska
- 1Department of Chemistry, Nicolaus Copernicus University, 87-100 Torun, Poland
| | | | - A. Dzielendziak
- 1Department of Chemistry, Nicolaus Copernicus University, 87-100 Torun, Poland
| | - A. Prewysz-Kwinto
- 1Department of Chemistry, Nicolaus Copernicus University, 87-100 Torun, Poland
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Prewysz-Kwinto A. Synthesis of 2-carbethoxybenzofuran derivatives. Chem Heterocycl Compd (N Y) 1987. [DOI: 10.1007/bf00486904] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Lesiak T, Hetper J, Pielichowski J, Prewysz-Kwinto A, Marzec K. Application of gas chromatography to the analysis of thermal decomposition products of some sulphur containing polyurethanes. POLYMER 1976. [DOI: 10.1016/0032-3861(76)90018-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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