在缓冲水溶液中使用O-苯基羟胺盐酸盐可以有效地将醛转化为腈。报告的方法专门针对包括碳水化合物在内的水溶性底物进行了优化。包括单糖、二糖和甲硅烷基保护的糖在内的几种还原糖以高产率转化为氰醇。反应条件也适用于从各种类型的疏水醛底物形成腈。此外,通过使用易于去除的弱碱性树脂作为促进剂,可以从氰醇中消除氰化物,类似于 Wohl 降解。
Two new compounds from the roots of <i>Ilex pubescens</i>
作者:Ting Wu、Qing-Wen Zhang、Xiao-Qi Zhang、Ge Liu、Lei Wang、Miao-Miao Jiang、Yi-Fan Feng、Wen-Cai Ye
DOI:10.1080/14786419.2011.598155
日期:2012.8.1
A new triterpenoid glycoside, heterobetulinic acid 3-O-beta-D-glucopyranosyl (1 -> 2)-beta-D-xylopyranoside (1), together with a new phenylacrylic acid derivative, 3'S,4'-dihydroxyl-2'-methylene-but-1'-enyl caffeate (2), were isolated from the roots of Ilex pubescens. Their structures were elucidated by HR-ESI-MS, 1-D and 2-D NMR analyses and chemical methods. In addition, the absolute configuration of 2 was established by the application of a modified Mosher's method.
Transformation of aldehydes into nitriles in an aqueous medium using O-phenylhydroxylamine as the nitrogen source
作者:Thamrongsak Cheewawisuttichai、Robert D. Hurst、Matthew Brichacek
DOI:10.1016/j.carres.2021.108282
日期:2021.4
The conversion of an aldehyde into a nitrile can be efficiently performed using O-phenylhydroxylamine hydrochloride in buffered aqueous solutions. The reported method is specifically optimized for aqueous-soluble substrates including carbohydrates. Several reducing sugars including monosaccharides, disaccharides, and silyl-protected saccharides were transformed into cyanohydrins in high yields. The
在缓冲水溶液中使用O-苯基羟胺盐酸盐可以有效地将醛转化为腈。报告的方法专门针对包括碳水化合物在内的水溶性底物进行了优化。包括单糖、二糖和甲硅烷基保护的糖在内的几种还原糖以高产率转化为氰醇。反应条件也适用于从各种类型的疏水醛底物形成腈。此外,通过使用易于去除的弱碱性树脂作为促进剂,可以从氰醇中消除氰化物,类似于 Wohl 降解。