The Effects of Substituents on the Geometry of π-π Interactions
作者:Seth E. Snyder、Bin-Syuan Huang、Yu W. Chu、Huei-Shian Lin、James R. Carey
DOI:10.1002/chem.201202253
日期:2012.10.1
hypothesis that substituentsstabilize π–π interactions regardless of their electronic character. To further investigate the origin of substituenteffects for π–π interactions, we synthesized and crystallized a series of 4‐substituted benzoyl leucine diethyl amides. Surprisingly, only two of the 4‐substituted compounds formed homochiral dimers. A comparison among the 4‐substituted compounds that crystallized
Brønsted Acid Accelerated Pd-Catalyzed Direct Asymmetric Allylic Alkylation of Azlactones with Simple Allylic Alcohols: A Practical Access to Quaternary Allylic Amino Acid Derivatives
A Brønsted acid accelerated Pd-catalyzed asymmetric allylicalkylation of azlactones with simple allylicalcohols under mild reaction conditions has been realized, which provides a direct and readily scalable approach for the synthesis of all-carbon quaternary allylic amino acid derivatives in excellent yields and good enantioselectivities.