diastereoselective syntheses, enantioselective syntheses diastereoselective syntheses, enantioselective syntheses (incl. cis/trans-isomerism) O 0031
-035Palladium(0)-Catalyzed Asymmetric Synthesis of 2-Vinylmorpholine and 2-Vinylpiperazine. Influence of the Biscarbonate Structure on the Enantioselectivity.-Whereas the title reaction of diol (Ia) with biscarbonates (II), (IV), and (V) gives the product (IIIa) with the same yields and enantioselectivities, the asymmetric cyclization of diaminobenzenes (Ib) and aminophenols (VI) depends strongly on the substituents at the nitrogen as well as the double bond geometry of biscarbonates. In order to have more information about the reasons for these quite different enantioselectivities, (E)and (Z)-isomeric allylic carbonate intermediates are prepared and submitted them to the cyclization conditions. -(MASSACRET, MAGALI; LAKHMIRI,
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