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Julia-Colonna method

The Julia-Colonna method, which uses polyleucine, can form an epoxide from a chalcone (Scheme 9.17).126-132 However, the method is limited to aryl-substituted enones and closely related systems, and even then scale up of the procedure has been found to be problematic.133 The product of the epoxidation 14 has been used in a synthesis of (+)-clausenamide (15).134... [Pg.132]

EnQy o R R2 Method s Julia-Colonna conditions Roberts conditions Ref- erence... [Pg.379]

Entry 0 R1 R2 R2 Method Julia-Colonna conditions yield ee (%) (%) Roberts conditions yield ee (%) (%) Ref- erence... [Pg.380]

A catalytic method for the preparation of enantiomerically pure oc,/i-epoxy ketones as building blocks for organic synthesis is highly desirable. Unfortunately, the Julia-Colonna... [Pg.184]

Besides the Shi epoxidation, which has also proven its potential in a series of other complex syntheses (532, 534, 542), the Julia-Colonna asynunetric epoxidation (543-545) using polyamino acid catalysts also has been found to be a versatile method in total synthesis (546-548). In 1998, the group of Roberts reported a... [Pg.132]

See other pages where Julia-Colonna method is mentioned: [Pg.57]    [Pg.1]    [Pg.26]    [Pg.316]    [Pg.57]    [Pg.1]    [Pg.26]    [Pg.316]    [Pg.375]    [Pg.375]    [Pg.190]    [Pg.153]    [Pg.48]    [Pg.212]    [Pg.250]    [Pg.250]    [Pg.447]   
See also in sourсe #XX -- [ Pg.57 ]

See also in sourсe #XX -- [ Pg.26 ]



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Julia-Colonna

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