A General Synthesis of Sphinganines through Multicomponent Catalytic Asymmetric Aziridination
作者:Munmun Mukherjee、Yubai Zhou、Anil K. Gupta、Yong Guan、William D. Wulff
DOI:10.1002/ejoc.201301766
日期:2014.3
either the (R) or (S) enantiomer of a BOROX catalyst, a multicomponent reaction of this aldehyde with an amine and ethyl diazoacetate gives rise to enantiomeric aziridine-2-carboxylates. Access to all diastereomers of sphinganine is realized upon ring opening of the enantiopure aziridine-2-carboxylate at the C-3 position by direct SN2 attack of an oxygen nucleophile, which occurs with inversion of configuration
Substrate-Induced Covalent Assembly of a Chemzyme and Crystallographic Characterization of a Chemzyme−Substrate Complex
作者:Gang Hu、Anil K. Gupta、Rui H. Huang、Munmun Mukherjee、William D. Wulff
DOI:10.1021/ja1070224
日期:2010.10.20
A substrate induced covalent assembly of a highly organized chemzyme known to be effective in both catalytic asymmetric aziridination and aza Diels-Alder reactions is described and the information gained from which led to an efficient one-pot aziridination protocol. The crystal structures of two chemzyme-iminium complexes were elucidated by X-ray diffraction analysis that provides critical insights into the binding of the substrates with the chemzyme.
Multicomponent Catalytic Asymmetric Aziridination of Aldehydes
作者:Anil K. Gupta、Munmun Mukherjee、William D. Wulff
DOI:10.1021/ol202472z
日期:2011.11.4
The first multicomponent catalytic asymmetric aziridination reaction is developed to give aziridine-2-carboxylic esters with very high diastereo- and enantioselectivity from aromatic and aliphatic aldehydes. This new method pushes the boundary of the aziridination reaction to substrates that failed with preformed imines.