Four synthetic equivalents of (iPr2N)2P-OCH2CH2CN (1) have been prepared from readily available enantiomerically pure β-hydroxynitriles as well as from chiralβ-hydroxy esters. To demonstrate their possible use as phosphinating/resolving agents, these phosphorodiamidites have been used in the synthesis of known phosphoric acids. The method allows enantiomerically pure acids to be obtained through separation
[EN] APPLICATION OF BIPHENYL PHOSPHATE COMPOUND AS GPR84 ANTAGONIST<br/>[FR] APPLICATION DE COMPOSÉ DE PHOSPHATE DE BIPHÉNYLE EN TANT QU'ANTAGONISTE DE GPR84<br/>[ZH] 联苯磷酸酯类化合物作为GPR84拮抗剂的应用
S–H bond insertionreaction was developed by cooperative catalysis of dirhodium(II) carboxylates and chiralspirophosphoricacids (SPAs) under mild and neutral reaction conditions with fast reaction rates, high yields (77–97% yields), and excellent enantioselectivities (up to 98% ee). The catalytic S–H bond insertionreaction provides a highly efficient method for the synthesis of chiral sulfur-containing
第一个高对映选择性的S–H键插入反应是通过在温和和中性的反应条件下以快速反应速率,高收率(77–97%的收率)协同催化羧酸二(II)盐和手性螺环磷酸(SPA)的催化作用而开发的,和出色的对映选择性(高达98%ee)。催化的S–H键插入反应为合成手性含硫化合物提供了一种高效的方法,并促进了手性含硫药物(S)-Eflucimibe的合成。一项系统的31 P NMR研究表明,反应中没有发生羧酸二吡啶(II)与SPA之间的配体交换。协同催化剂Rh 2的不同行为(TPA)4 /(R)-1a和通过原位FT-IR光谱观察到的制备的复合物Rh 2(R - 1a)4排除了Rh 2(R -SPA)4的可行性。是真正的催化剂。DFT计算表明,质子转移步骤中的激活势垒由于SPA的促进而显着降低。根据实验结果和计算结果,提出将SPA用作反应中质子转移的手性质子穿梭体。另外,测量了几个SPA的单晶结构,并用于合理化反
Asymmetric NH Insertion Reaction Cooperatively Catalyzed by Rhodium and Chiral Spiro Phosphoric Acids
dirhodium(II) carboxylates and chiralspirophosphoricacids (SPA) cooperativelycatalyzedasymmetricNHinsertionreactions with high enantioselectivity, high yields, and fast reaction rates at low catalyst loading (see scheme; Boc=tert‐butyloxycarbonyl, TPA=triphenylacetyl). Chiralspirophosphoricacid assisted asymmetric proton transfer is proposed as the chiral induction step.