Diels Alkali metal Lewis acid

Scheme 3.3 Diels-Alder reactions with alkali metal Lewis acid.

Asymmetric Diels-Alder reaction mediated by alkali metal Lewis acid has been developed with optically active diene or dienophile [26-28]. On the other hand, asymmetric Diels-Alder reaction using chiral alkali metal catalyst is few. Probably, since alkali metal Lewis acid is generally a mild Lewis acid, chiral alkali metal... [Pg.113]

Hetero Diels-Alder reaction mediated by alkali metal Lewis acid has also been reported [21, 29, 30]. [Pg.114]

Another alternative, LiNTfa, was also employed as Lewis acid catalyst (1 mol %) in the Diels-Alder reaction of CP with MVK in CH2CI2. The rate enhancement was moderate compared with that obtained with the other alkali earth and lanthanide metal imides Mg(NTf2)2, La(NTf2)3.H20, and Zn(NTfa)2 (Sch. 25) [73]. [Pg.29]

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