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翻译一段有机化学的英文文献
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The same research group developed two different protocols for the preparation of 2-substituted-3- allylbenzofurans from o-alkynylphenols and allyl carbonates under palladium catalysis 。 The stepwise method (method A) was based on the preparation of stereo- and regioisomeric mixtures of O-allyl derivatives and their subsequent cyclization to benzofurans, being the method of choice when steric differences between the two allylic termini are small. The one-pot protocol (method B), omitting isolation of the O-allyl derivatives, was employed when the reaction proceeds through è3-allylpalladium complexes and also when the two allylic termini are markedly different from a steric point of view. Concerning the reaction mechanism, the cyclization of the O-allyl derivatives was suggested to proceed through the palladium-promoted ionization of the allylic C-O bond and displacement of one ligand to the palladium by the carbon-carbon triple bond, intramolecular nucleophilic attack of the oxygen atom across the activated carbon-carbon triple bond, and reductive elimination 。 |
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2楼2011-02-20 19:31:49
3楼2011-02-20 19:54:34
4楼2011-02-20 22:46:09
answerball(金币+1, 翻译EPI+1): 2011-02-21 16:05:23
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The stepwise method (method A) was based on the preparation of stereo- and regioisomeric mixtures of O-allyl derivatives and their subsequent cyclization to benzofurans, being the method of choice when steric differences between the two allylic termini are small. 分布反应（方法A）是基于O-烯丙基取代物以及接下来的环化形成苯并呋喃立体选择性和区域选择性混合物。该方法在当两种烯丙基目标分子的立体差别不大时使用！ |
5楼2011-02-21 08:45:21
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