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嗜血风铃

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As using optically pure L-phenylalanine as starting material, so
we suggested that all of these palladium complexes were chiral
because the chiral center would survive in all the experimental
process. The X-ray structure of 3a and 3c confirmed there is a
stereogenic center with S configuration in  the back bone of
imidazoline ring. The specific rotation of these Pd complexes in
DCM is 6.3 ° for 3a; 104.8 ° for 3b; 78.9 ° for 3c and 72.4 ° for
3d.
To evaluate the catalytic activity of 3a-3d in the Cu-free
Sonogashira coupling reactions under aerobic conditions, we
performed the reaction of 1-iodo-2-methoxybenzene with
phenylacetylene in DMSO in presence of K2CO3 as base at 100
oC for 1 h, using 1 mol % catalyst loading. As it can be seen from
the results shown in Table 2 (entries 1-4), complex 3a is the one
that provides the best activity (69% yield), whereas the other
complexes (3b-3d) do not show good activity, especially 3d
leading to only 31% yield.

求快速翻译
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嗜血风铃: 金币+20, 翻译EPI+1, ★★★很有帮助, good 2014-11-04 10:11:48
因为使用了光学纯的L-苯丙氨酸为起始原料,所以我们认为所有这些钯复合物都是是手性的,因为手性中心可以在所有的实验过程中存留下来。3a和3c的X-射线结构证在咪唑啉环的主链有一具有S构型的手性中心。在DCM这些钯复合物的比旋光度为:3a是6.3°; 3b是104.8°; 3c是78.9°;3d是72.4°。
在有氧而无铜的条件下,用Sonogashira偶联反评价了3a-3d的催化活性。反应用1-碘-2-甲氧基苯和苯乙炔在DMSO中进行,用K2CO3提供碱,在100℃反应1小时,使用1%摩尔的催化剂负载量。从表2结果(条目1-4)可以看出,复合3a的活性活性最佳(产率69%),而其他复合物(3b〜3d)都不具有出良好的活性,特别是3d只引起31%的产率。
2楼2014-11-04 09:14:30
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