催化量的Re 2 O 7和亚磷酸三苯酯作为还原剂的组合对于未活化的脂族环氧化物脱氧为烯烃是有效的。该反应在中性条件下与各种取代的环氧化物立体定向进行,并且与各种官能团相容。作为当前rh催化的脱氧方案的实例,显示了使用环氧化物对双键官能团的保护和脱保护。还研究了还原剂对立体选择性的影响,表明使用缺电子的膦或亚磷酸酯是立体特异性脱氧的关键。
催化量的Re 2 O 7和亚磷酸三苯酯作为还原剂的组合对于未活化的脂族环氧化物脱氧为烯烃是有效的。该反应在中性条件下与各种取代的环氧化物立体定向进行,并且与各种官能团相容。作为当前rh催化的脱氧方案的实例,显示了使用环氧化物对双键官能团的保护和脱保护。还研究了还原剂对立体选择性的影响,表明使用缺电子的膦或亚磷酸酯是立体特异性脱氧的关键。
A NOVEL METHOD FOR THE GENERATION OF AN ESTER ENOLATE ANION FROM ETHOXYACETYLENE
作者:Teruaki Mukaiyama、Masahiro Murakami
DOI:10.1246/cl.1981.1129
日期:1981.8.5
An ester enolate anion was generated in situ by the successive treatment of ethoxyacetylene with mercury(II) chloride, pyridine-1-oxide and zinc dust, and the zinc enolate thus formed further reacted with aldehydes to give α-chloro-β-hydroxyesters.
The present invention provides compositions for inhibiting proteases, methods for synthesizing the compositions, and methods of using the disclosed protease inhibitors. Aspects of the invention include aza-peptide epoxide compositions that inhibit proteases, for example cysteine proteases, either in vivo or in vitro. The disclosed compounds, pharmaceutically acceptable salts, pharmaceutically acceptable derivatives, prodrugs, or combinations thereof can be used to treat disease or pathological conditions related to the activity of proteases associated with a specific disease or condition. Such treatable conditions include viral infections, stroke, neurodegenerative disease, and inflammatory disease, among others.
Yttrium-Catalyzed Regioselective Aminolysis of 2,3-Epoxy Esters and Amides
作者:Chuan Wang、Hongqing Yao
DOI:10.1055/a-2077-5084
日期:2023.12
Herein, an yttrium-catalyzed regioselective ring-opening reaction of 2,3-epoxy esters and amides with amines as nucleophiles is presented. This method features high regiocontrol, an enantiospecific SN2 reaction pathway, a broad substrate scope, and mild reaction conditions, furnishing a wide range of α-hydroxy β-amino esters and amides in regioisomerically pure forms. Notably, the selective nucleophilic
在此,介绍了一种钇催化的 2,3-环氧酯和酰胺与胺作为亲核试剂的区域选择性开环反应。该方法具有高区域控制、对映特异性 S N 2 反应途径、广泛的底物范围和温和的反应条件,可提供范围广泛的区域异构纯形式的 α-羟基 β-氨基酯和酰胺。值得注意的是,对 C-3 位的选择性亲核攻击受底物羰基的定向作用控制。
MUKAIYAMA, TERUAKI;MURAKAMI, MASAHIRO, CHEM. LETT., 1981, N 8, 1129-1132
作者:MUKAIYAMA, TERUAKI、MURAKAMI, MASAHIRO
DOI:——
日期:——
EISTETTER, K.;WOLF, H. P. O., J. MED. CHEM., 1982, 25, N 2, 109-113