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answerball

金虫 (小有名气)


[交流] 翻译一段有机化学的英文文献

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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抱着金币去死!
2楼2011-02-20 19:31:49
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answerball

金虫 (小有名气)


引用回帖:
Originally posted by 8814402 at 2011-02-20 11:31:49:
抱着金币去死!

看的懂的话也是举手之劳,金币本来也没什么用
3楼2011-02-20 19:54:34
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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.

同一个研究小组开发了两种不同的方法,都是在钯催化条件下,由邻苯基苯酚烷基和碳酸盐合成2-取代-3烯丙基苯并呋喃。
4楼2011-02-20 22:46:09
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answerball(金币+1, 翻译EPI+1): 2011-02-21 16:05:23

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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