Efficient Highly Selective Synthesis of Methyl 2-(Ethynyl)alk-2(<i>E</i>)-enoates and 2-(1′-Chlorovinyl)alk-2(<i>Z</i>)-enoates from 2-(Methoxycarbonyl)-2,3-allenols
作者:Youqian Deng、Xin Jin、Chunling Fu、Shengming Ma
DOI:10.1021/ol9004273
日期:2009.5.21
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.
在Et 3 N或DMSO存在下,易于获得的2-(甲氧基羰基)-2,3-烯醇1与草酰氯的高度区域和立体选择性反应,生成了2-(乙炔基)alk-2(E)-烯酸甲酯(E)-2和2-(1'-氯乙烯基)alk-2(Z)-烯酸酯(Z)-3的产率中等至良好。