An efficient, asymmetric organocatalyst-mediated conjugate addition of nitroalkanes to unsaturated cyclic and acyclic ketones
作者:Claire E. T. Mitchell、Stacey E. Brenner、Jorge García-Fortanet、Steven V. Ley
DOI:10.1039/b601877g
日期:——
5-Pyrrolidin-2-yltetrazole is a versatile organocatalyst for the asymmetric conjugateaddition of nitroalkanes to enones. Using this catalyst, this transformation requires short reaction times, tolerates a broad substrate scope, and possibly proceeds via generation of an iminium species.
The Michael addition of nitroalkanes to alpha,beta-unsaturated enones catalyzed by a novel chiral imidazolidine-2-yltetrazole organocatalyst has been investigated. The new more soluble organocatalyst decreases reaction times and improves enantioselectivities compared to other catalysts. The Michael addition adducts were obtained with up to 92% ee. [reaction: see text]