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Volumn 38, Issue 1-2, 1999, Pages 121-124

Efficient entry to tetrahydropyridines: Addition of enol ethers to allenesulfonamides involving a novel 1,3-sulfonyl shift

Author keywords

1,3 sulfonyl shift; Allenes; Cyclizations; Oxazolidinones; Tetrahydropyridines

Indexed keywords

ALLENESULFONAMIDE; PYRIDINE DERIVATIVE; TETRAHYDROPYRIDINE DERIVATIVE; UNCLASSIFIED DRUG;

EID: 0033555653     PISSN: 14337851     EISSN: None     Source Type: Journal    
DOI: 10.1002/(SICI)1521-3773(19990115)38:1/2<121::AID-ANIE121>3.0.CO;2-D     Document Type: Article
Times cited : (35)

References (41)
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    • Similar coupling patterns and nOes were observed for cis-3f and cis-3i. See the Experimental Section for the characteristic coupling patterns that trans-3 displays.
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    • Thiophene failed to react with 1a to furnish 3. Instead, 4-vinyl-4-oxazolin-2-one (product of a 1,3-hydrogen shift) was provided in 88% yield (1a/thiophene = 1/100 mol/mol. 80 C. 11 h)
    • Thiophene failed to react with 1a to furnish 3. Instead, 4-vinyl-4-oxazolin-2-one (product of a 1,3-hydrogen shift) was provided in 88% yield (1a/thiophene = 1/100 mol/mol. 80 C. 11 h).
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    • 1H NMR spectroscopy and HPLC. There were only very small amounts of impurities; 20, 29, and 51% conversions after 2,4, and 9 h at 70 C, respectively
    • 1H NMR spectroscopy and HPLC. There were only very small amounts of impurities; 20, 29, and 51% conversions after 2,4, and 9 h at 70 C, respectively.
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    • We thank the referee who pointed out the possibility that 3g might be formed by the Diels - Alder addition of turan (4π) and the vinyl group of 5 and subsequent 1-aza-Cope rearrangement
    • We thank the referee who pointed out the possibility that 3g might be formed by the Diels - Alder addition of turan (4π) and the vinyl group of 5 and subsequent 1-aza-Cope rearrangement.


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