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Finally, using a g-substituted allenoate, the desired product is obtained with a lower yield (30%, Table 1, entry 12). The isomerization of the allene into the corresponding diene was the main reaction. The method provides functional 1-allylazoles with a predominant E-stereoselectivity, the E/Z ratio ranging from 64/36 to 100/0. The stereoselectivity can be easily explained by assuming that the elimination step follows an E1cB mechanism where unfavorable steric hindrance between the azole and the electron withdrawing group induces the preferential formation of the E-isomer. |
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RXMCDM: ½ð±Ò+1 2014-05-13 14:07:30
gx123go: ½ð±Ò+10, ·ÒëEPI+1, ¡ï¡ï¡ï¡ï¡ï×î¼Ñ´ð°¸ 2014-05-20 09:22:17
RXMCDM: ½ð±Ò+1 2014-05-13 14:07:30
gx123go: ½ð±Ò+10, ·ÒëEPI+1, ¡ï¡ï¡ï¡ï¡ï×î¼Ñ´ð°¸ 2014-05-20 09:22:17
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