[GRAPHICS]A 4-component Ugi reaction with a suitable isocyanide, followed by a novel secondary transformation involving a Pd(II)-mediated (R-5 = H) or a Pd(0)-mediated (RI = CO2Me) S(N)2' cyclization to give highly functionalized N-acyl-2-vinylpyrrolidines, is reported. The overall yields are usually good and in most cases the Pd(0)-catalyzed reaction gave the final product in almost quantitative yield.
Enantioselective synthesis of martinelline chiral core and its diastereomer using asymmetric tandem Michael–aldol reaction
The martinelline chiral core 3 and its diastereomer were synthesized by using the asymmetrictandemMichael–aldolreaction as the key step from 4-methoxycarbonylanthranilaldehyde and the α,β-unsaturated aldehyde.