Enantioselective thiourea-catalyzed cationic polycyclizations.
Enantioselective thiourea-catalyzed cationic polycyclizations.
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DOI:
10.1021/ja101256v
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发表时间:
2010-04-14
影响因子:
15
通讯作者:
Jacobsen EN
中科院分区:
文献类型:
--
作者:
Knowles RR;Lin S;Jacobsen EN
A new thiourea catalyst is reported for the enantioselective cationic polycyclization of hydroxylactams. Both the yield and enantioselectivity of this transformation were found to vary strongly with the identity of a single aromatic residue on a common catalyst framework, with more expansive and polarizable arenes proving optimal. Evidence is presented for a mechanism in which stabilizing cation-π interactions are a principal determinant of enantioselectivity.
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