Synthesis of optically active 2,3-substituted-1,2,3,4-tetrahydro-4-quinolones using polyleucine
摘要:
Polyleucine catalyzes the asymmetric epoxidation of enone (1) in a non-aqueous medium to provide epoxy-ketones (2) and (3) (81 and 84% yields respectively; >98% ee). The epoxy-ketones (2) and (3) are subsequently cyclized to give 1,2,3,4-tetrahydro-4-quinolones (4) and (5) respectively, (C) 1998 Elsevier Science Ltd. All rights reserved.
Synthesis of optically active 2,3-substituted-1,2,3,4-tetrahydro-4-quinolones using polyleucine
摘要:
Polyleucine catalyzes the asymmetric epoxidation of enone (1) in a non-aqueous medium to provide epoxy-ketones (2) and (3) (81 and 84% yields respectively; >98% ee). The epoxy-ketones (2) and (3) are subsequently cyclized to give 1,2,3,4-tetrahydro-4-quinolones (4) and (5) respectively, (C) 1998 Elsevier Science Ltd. All rights reserved.
Scoping the triphasic/PTC conditions for the Juliá–Colonna epoxidation reaction
作者:Thomas Geller、Christa M. Krüger、H.-Christian Militzer
DOI:10.1016/j.tetlet.2004.04.189
日期:2004.6
A new, highly efficient procedure for the Juliá–Colonnaepoxidation is reported. Based on the original triphasic protocol it is shown that the co-catalysis of the reaction with phase transfer catalysts results in a dramatic increase of reactivity and sometimes also in a higher enantiomeric excess of product. The required amount of polyamino acid can be significantly reduced under the new conditions
A new procedure for the Juliá–Colonna stereoselective epoxidation reaction under non-aqueous conditions: the development of a catalyst comprising polyamino acid on silica (PaaSiCat)
作者:Thomas Geller、Stanley M. Roberts
DOI:10.1039/a903219c
日期:——
Polyleucine adsorbed onto silica provides a robust, readily-recycled, highly active catalyst for the asymmetric epoxid-ation of the α,β-unsaturated ketones 1, 2 and 3.
Synthesis of optically active 2,3-substituted-1,2,3,4-tetrahydro-4-quinolones using polyleucine
作者:Wei-ping Chen、Ann L. Egar、Michael B. Hursthouse、K.M. Abdul Malik、Judo E. Mathews、Stanley M. Roberts
DOI:10.1016/s0040-4039(98)01249-0
日期:1998.11
Polyleucine catalyzes the asymmetric epoxidation of enone (1) in a non-aqueous medium to provide epoxy-ketones (2) and (3) (81 and 84% yields respectively; >98% ee). The epoxy-ketones (2) and (3) are subsequently cyclized to give 1,2,3,4-tetrahydro-4-quinolones (4) and (5) respectively, (C) 1998 Elsevier Science Ltd. All rights reserved.