5‐Substituted Derivatives of the Tricyclic (+)‐Sparteine Surrogate in the Enantioselective Lithiation/Stannylation of an O‐Alkyl Carbamate
5‐Substituted Derivatives of the Tricyclic (+)‐Sparteine Surrogate in the Enantioselective Lithiation/Stannylation of an O‐Alkyl Carbamate
复制标题
5â三环 ( )â 钏石碱替代物在 Oâ烷基氨基甲酸酯的对映选择性锂化/甲锡烷基化中的取代衍生物
DOI:
10.1002/ejoc.201300987
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发表时间:
2013
影响因子:
2.8
通讯作者:
D. Hein
中科院分区:
文献类型:
--
作者:
M. Breuning;D. Hein
5‐Mono‐ and 5,5‐disubstituted tricyclic bispidines, derivatives of the known (+)‐sparteine surrogate, have been synthesized in four‐to‐six steps from the natural alkaloid (–)‐cytisine and evaluated as chiral ligands in the enantioselective lithiation/stannylation of anO‐alkyl carbamate. Structure–selectivity studies revealed that a small 5‐endosubstituent is tolerated, whereas larger 5‐endosubstituents and even small 5‐exosubstituents lead to significantly reduced levels of chirality transfer.
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DOI:
--
发表时间:
1999
期刊:
影响因子:
--
作者:
K. Tomooka;H. Shimizu;Tadashi Inoue;Hikaru Shibata;T. Nakai
通讯作者:
T. Nakai
影响因子:
--
作者:
D. Hoppe;T. Hense
通讯作者:
T. Hense
影响因子:
3.2
作者:
Hermet, JPR;Porter, DW;Smith, NM
通讯作者:
Smith, NM
影响因子:
4.9
作者:
J. Harrison;P. O’Brien;D. Porter;N. M. Smith
通讯作者:
N. M. Smith
影响因子:
1.8
作者:
HOPPE, D;HINTZE, F;HOPPE, I
通讯作者:
HOPPE, I