Geometric
<i>E</i>
→
<i>Z</i>
Isomerisation of Alkenyl Silanes by Selective Energy Transfer Catalysis: Stereodivergent Synthesis of Triarylethylenes via a Formal
<i>anti</i>
‐Metallometallation
作者:Svenja I. Faßbender、John J. Molloy、Christian Mück‐Lichtenfeld、Ryan Gilmour
DOI:10.1002/anie.201910169
日期:2019.12.16
An efficient geometrical E→Z isomerisation of alkenyl silanes is disclosed via selective energy transfer using an inexpensive organic sensitiser. Characterised by operational simplicity, short reaction times (2 h), and broad substrate tolerance, the reaction displays high selectivity for trisubstituted systems (Z/E up to 95:5). In contrast to thermal activation, directionality results from deconjugation
通过使用廉价的有机敏化剂的选择性能量转移,公开了烯基硅烷的有效几何E→Z异构化。该反应的特点是操作简便,反应时间短(2小时)和广泛的底物耐受性,该反应对三取代系统显示出高选择性(Z / E高达95:5)。与热激活相反,方向性是由于A1,3-应变导致Z异构体中的π系统解共轭,从而抑制了再激活。β取代基的结构重要性从逻辑上促进了对混合双亲核试剂(Si,Sn,B)的研究。这些多用途的关键销钉也易于异构化,从而实现了正式的抗金属金属化。机械询问,在理论研究的支持下,