Catalytic Asymmetric Synthesis. Группа авторов

Catalytic Asymmetric Synthesis - Группа авторов


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backbone (Ar) and that attached on the guanidine nitrogen (G) had a strong impact on the stereoselectivity of the reactions. Chiral guanidine 29a was also utilized in the enantioselective direct vinylogous aldol reaction of furanones, as well as vinylogous Michael addition of furanones to nitroalkenes, to provide the corresponding adducts in high yields with high enantioselectivities (Scheme 3.43) [78].

      Source: [78].

Schematic illustration of enantioselective amination of beta-dicarbonyl compounds with azodicarboxylate catalyzed by 30a.

      Source: Based on [79].

      3.4.1. Chiral Cyclopropenimine Catalysts

Schematic illustration of enantioselective additions of glycine imines catalyzed by 31.

      Source: Based on [82]. Source: Based on [81] and [82].

Schematic illustration of mechanistic rationale.

      Source: [83].

Schematic illustration of enantioselective [3+2] cycloaddition of glycine imines with 2-acyl cycloheptatrienes catalyzed by 31.

      Source: Based on [84].

      3.4.2. Chiral Triaryliminophosphorane Catalysts

Schematic illustration of chiral bifunctional iminophosphorane (BIMP) catalysts.
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