Unusual reagent control of diastereoselectivity in the 1,2-addition of hard carbon nucleophiles to C(6)-heteroatom substituted cyclohexenones.

Unusual reagent control of diastereoselectivity in the 1,2-addition of hard carbon nucleophiles to C(6)-heteroatom substituted cyclohexenones.
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硬碳亲核试剂与 C(6)-杂原子取代的环己烯酮 1,2-加成过程中非对映选择性的异常试剂控制。

DOI:
10.1021/ol016673j
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发表时间:
2001
期刊:
影响因子:
5.2
通讯作者:
McIntosh,MC
McIntosh,MC
中科院分区:
化学1区
文献类型:
--
作者:
Lindsay,HA;Salisbury,CL;Cordes,W;McIntosh,MC

文献摘要

被引文献

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在硬碳亲核试剂与 C6-杂取代的环己烯酮的 1,2-加成中发现了令人惊讶且合成上有用的抗衡离子依赖性非对映选择性逆转。一般来说,格氏试剂在 C6 取代基上添加顺式,而锂试剂在 C6 取代基上添加反式,但也发现了一些例外。在某些情况下,可以通过适当选择溶剂和/或助溶剂来提高选择性。
A surprising and synthetically useful counterion-dependent reversal of diastereoselectivity was found in 1,2-additions of hard carbon nucleophiles to C6-heterosubstituted cyclohexenones. In general, Grignard reagents addedsynto the C6-substituent and Li reagents addedanti, although some exceptions were found. Selectivities could be increased in some cases by appropriate choice of solvent and/or cosolvent.