Efficient Highly Selective Synthesis of Methyl 2-(Ethynyl)alk-2(E)-enoates and 2-(1′-Chlorovinyl)alk-2(Z)-enoates from 2-(Methoxycarbonyl)-2,3-allenols

Efficient Highly Selective Synthesis of Methyl 2-(Ethynyl)alk-2(E)-enoates and 2-(1′-Chlorovinyl)alk-2(Z)-enoates from 2-(Methoxycarbonyl)-2,3-allenols

Highly regio- and stereoselective reactions of readily available 2-(methoxycarbonyl)-2,3-allenols 1 with oxalyl chloride in the presence of Et3N or DMSO afforded methyl 2-(ethynyl)alk-2(E)-enoates (E)-2 and 2-(1′-chlorovinyl)alk-2(Z)-enoates (Z)-3, respectively, in moderate to good yields.

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Veröffentlicht in:Organic letters 2009-05, Vol.11 (10), p.2169-2172
Hauptverfasser: Deng, Youqian, Jin, Xin, Fu, Chunling, Ma, Shengming
Format: Artikel
Sprache:eng
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Zusammenfassung:Highly regio- and stereoselective reactions of readily available 2-(methoxycarbonyl)-2,3-allenols 1 with oxalyl chloride in the presence of Et3N or DMSO afforded methyl 2-(ethynyl)alk-2(E)-enoates (E)-2 and 2-(1′-chlorovinyl)alk-2(Z)-enoates (Z)-3, respectively, in moderate to good yields.
ISSN:1523-7060
1523-7052
DOI:10.1021/ol9004273