烷基1,8-萘二甲酸单酯1a-d的水解受到相邻COOH基团的高效分子内亲核催化作用。为COOH反应的反应性取决于离去基团P ķ一个,用值β LG -0.50,与涉及四面体加成中间体的速率确定击穿的机制是一致的。所述的立体应变的释放围-substitiuents在高反应性烷基1,8-萘二羧酸单酯是基本的理解在此分子内反应所观察到的特殊反应性。DFT计算表明,溶剂可如何催化中性酯裂解中涉及的质子转移水,从而有利于不良醇盐离去基团的离开。
PASSAROTTI, C.;BADONE, D.;FOSSATI, A.;BANDI, G., BOLL. CHIM. FARM., 127,(1988) N 2, C. 54-59
作者:PASSAROTTI, C.、BADONE, D.、FOSSATI, A.、BANDI, G.
DOI:——
日期:——
Mechanism of intramolecular catalysis in the hydrolysis of alkyl monoesters of 1,8-naphthalic acid
作者:Bruno S. Souza、Santiago F. Yunes、Marcelo F. Lima、José C. Gesser、Marcus M. Sá、Haidi D. Fiedler、Faruk Nome
DOI:10.1039/c1ob05574g
日期:——
Hydrolysis of alkyl 1,8-naphthalic acid monoesters 1a–d is subject to highly efficient intramolecular nucleophilic catalysis by the neighboring COOH group. The reactivity for the COOH reaction depends on the leaving group pKa, with values of βLG of −0.50, consistent with a mechanism involving rate determining breakdown of tetrahedral addition intermediates. The release of the steric strain of the peri-substitiuents
烷基1,8-萘二甲酸单酯1a-d的水解受到相邻COOH基团的高效分子内亲核催化作用。为COOH反应的反应性取决于离去基团P ķ一个,用值β LG -0.50,与涉及四面体加成中间体的速率确定击穿的机制是一致的。所述的立体应变的释放围-substitiuents在高反应性烷基1,8-萘二羧酸单酯是基本的理解在此分子内反应所观察到的特殊反应性。DFT计算表明,溶剂可如何催化中性酯裂解中涉及的质子转移水,从而有利于不良醇盐离去基团的离开。
An Anomeric
<scp>Base‐Tolerant</scp>
Ester of
<scp>8‐Alkynyl</scp>
‐1‐naphthoate for Gold(I)‐Catalyzed Glycosylation Reaction
samples, which mainly relies on the key glycosylation reaction. Consistent with enormous efforts to develop leaving groups for establishing robust glycosylation protocols, we herein disclose a structurally novel leaving group of 8-phenylethynyl-1-naphthoate that is able to enable efficient glycosylation reactions under the extremely mild condition of gold(I)-catalysis. Notably, the anomeric naphthoate possesses