Tetrahedron Letters p. 4213 - 4216 (1995)
Update date:2022-08-30
Topics:
Braun, Manfred
Sacha, Hubert
Galle, Dietmar
El-Alali, Abdullah
The condensation of doubly deprotonated triphenylglycol propionate 4a and imines 1 leads to the formation of trans β-lactams 5 in a diastereoselective and enantioselective manner (85 to > 97percent e.e.).On the other hand, the lithium enolates of the propionates 4b,c, derived from triphenylglycol as well, afford predominantly cis 2-azetidinones 6 in 87 to > 97percent e.e.
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