Isophthalic Acid–Derived Dicarbothioamides as Novel Metal-Free Catalysts in Hydrogen Bond–Promoted Reactions
作者:Stefania Guizzetti、Maurizio Benaglia、Alessandra Puglisi、Laura Raimondi
DOI:10.1080/00397910902838847
日期:2009.9.18
Abstract The synthesis of N,N′-diaryl-1,3-benzene-dicarbothioamides was accomplished in only two steps with good yields, and their ability to act as hydrogen-bond donors in Diels–Alder reactions was evaluated. These new organocatalysts were indeed able to promote the cycloaddition of cyclopentadiene to α,β-unsaturated aldehydes. In the attempt to control the absolute stereochemistry of the reaction
摘要 N,N'-二芳基-1,3-苯二硫代酰胺的合成只需两步即可完成,产率良好,并评估了它们在Diels-Alder反应中作为氢键供体的能力。这些新的有机催化剂确实能够促进环戊二烯环加成生成 α,β-不饱和醛。为了控制反应的绝对立体化学,还通过间苯二甲酸和α-氨基酸衍生物的简单缩合制备了手性催化剂。进行分子力学计算以阐明这些无金属催化体系的作用模式,并找到实现对映选择性的基本原理。