AcOLeDMAP and BnOLeDMAP: conformationally restricted nucleophilic catalysts for enantioselective rearrangement of indolyl acetates and carbonates.
AcOLeDMAP and BnOLeDMAP: conformationally restricted nucleophilic catalysts for enantioselective rearrangement of indolyl acetates and carbonates.
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DOI:
10.1021/ja805541u
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发表时间:
2009-01-14
影响因子:
15
通讯作者:
Vedejs, Edwin
中科院分区:
文献类型:
--
作者:
Duffey, Trisha A.;Shaw, Scott A.;Vedejs, Edwin
The rate of indolyl O- to C-acetyl or carboxyl rearrangement is accelerated by the electron withdrawing N-diphenylacetyl group (DPA) using the conformationally restricted chiral catalysts AcOLeDMAP (12b) and BnOLeDMAP (13b). Highly enantioselective conversion to quaternary C-acetylated and C-carboxylated oxindoles is observed, even for substrates containing branched substituents. The rearrangement of the carboxylate substrates 19 occurs with complementary enantiofacial selectivity using catalyst 13b compared to the acetyl migrations of 16 catalyzed by 12b. Access to N-unsubstituted oxindoles is demonstrated by DPA cleavage with Et2NH.
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