Synthesis, Properties, and Crystal Structure of Silyl Nitronates (Silyl Esters ofaci-Nitroalkanes): Towards theSN2 Reaction Path with Retention of Configuration at Silicon
作者:Ernest W. Colvin、Albert K. Beck、Bahram Bastani、Dieter Seebach、Yasushi Kai、Jack D. Dunitz
DOI:10.1002/hlca.19800630320
日期:1980.4.23
the preparation of silyl nitronates is described (see 1–10). NMR. spectral investigations indicate a rapid 1,3-silylmigration process, with an activation energy of about 10 kcal mol−1. X-ray crystallographic studies on the silyl nitronates 3 and 8 show structures that lean towards an SN2 retention pathway at silicon.
描述了一种高效,灵活的制备甲磺酸硅烷基酯的方法(参见1-10)。核磁共振。光谱研究表明,快速的1,3-甲硅烷基迁移过程具有约10 kcal mol -1的活化能。对甲硅烷基磺酸盐3和8的X射线晶体学研究表明,其结构倾向于向S N 2保留在硅的路径。
Metal-Catalyzed Synthesis of Functionalized 1,2,4-Oxadiazoles from Silyl Nitronates and Nitriles
作者:Paul Nikodemiak、Ulrich Koert
DOI:10.1002/adsc.201601378
日期:2017.5.17
to 1,2,4‐oxadiazoles is described. Silver(I) triflate (AgOTf) and and ytterbium(III) triflate [Yb(OTf)3] are suitable catalysts. A variety of functional groups is tolerated in the nitrile. The reaction works well for alkenyl and aryl silyl nitronates while the use of alkyl silyl nitronates is less efficient. Mechanistic studies are in favour of an elimination of tert‐butyl(dimethyl)silanol (TBSOH) after