Unexpected syn hydride migration in the non-aldol aldol reaction

Unexpected syn hydride migration in the non-aldol aldol reaction
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DOI:
10.1021/ol0350801
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发表时间:
2003-09-18
期刊:
影响因子:
5.2
通讯作者:
Houk, KN
Houk, KN
中科院分区:
化学1区
文献类型:
--
作者:
Jung, ME;van den Heuvel, A;Houk, KN

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环氧甲硅烷基醚13 b的非羟醛羟醛重排得到预期的反甲基酮14,而非对映体环氧甲硅烷基醚13 a通过前所未有的顺式氢化物迁移得到顺式甲基酮8b。计算表明,这种不寻常的反应是通过碳正离子进行的,由于空间位阻,碳正离子不容易旋转。
Non-aldol aldol rearrangement of the epoxy silyl ether 13b afforded the expected anti methyl ketone 14, while the diastereomeric epoxy silyl ether 13a afforded the syn methyl ketone 8b via an unprecedented syn hydride migration. Calculations suggest that this unusual reaction proceeds via the carbocation, which cannot easily rotate due to steric hindrance.