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有機催化不對稱Mannich反應中的熱效應
閱讀:2800發(fā)布時間:2009-7-23
Thermal Effects in the Organocatalytic Asymmetric Mannich Reaction
The proline-catalyzed direct asymmetric Mannich reaction between cyclohexanone, formaldehyde, and various anilines is thermally accelerated. With only 0.5 mol % of catalyst, Mannich products with up to 98% ee have been obtained after a short period of time in reactions performed under microwave irradiation. In situ reduction of the resulting ketones affords N-aryl amino alcohols in up to 86% yield.
有機催化不對稱Mannich反應中的熱效應
脯氨酸直接催化不對稱曼尼希反應(Mannich Reaction)中的環(huán)己酮(cyclohexanone),甲醛(formaldehyde),和各種苯胺是熱加速。只需要0.5mol %的催化劑,在微波輻射下,只要很短的時間內(nèi)完成反應就能得到曼尼希(Mannich)產(chǎn)品達98 % ee。原位還原反應中, 由酮造成的N -芳基氨基醇(N-aryl amino alcohols)多達86 %的產(chǎn)量。
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