New access to fused vinylcyclopropanes by radical cyclization
摘要:
A new methodology allowing to assemble fused vinylcyclopropanes by cyclization of vinyl radicals is herein reported. This methodology is based on the trapping of the cyclopropylcarbinyl radical intermediate by B phenylthiyl elimination which provides the vinylcyclopropane. Preliminary results on a few model compounds illustrate the feasibility and usefulness of the method.
Cornforth–Evans Transition States in Stereocontrolled Allylborations of Epoxy Aldehydes
作者:Robert R. A. Freund、Matthias Borg、Daniel Gaissmaier、Robin Schlosser、Timo Jacob、Hans‐Dieter Arndt
DOI:10.1002/chem.202001479
日期:2020.7.14
(CE) model for alkoxy‐ and epoxy‐substitutedaldehydes. CE‐type transition states were uniformly identified as minima in advanced, DFT‐based computational studies of allylboration reactions of epoxy aldehydes, conforming well to the experimental data, and highlighting the underestimated relevance of this model. Furthermore, a mechanism‐based rationale for the substitution pattern of the epoxide was delineated
Preparation of 2-Iodo Allylic Alcohols from 2-Butyn-1,4-diol
作者:Douglass F. Taber、M. Inthikhab Sikkander、James F. Berry、Kevin J. Frankowski
DOI:10.1021/jo7021197
日期:2008.2.1
The conversion of 2-butyn-1,4-diol to (Z)-2,4-diiodobut-2-en-1-ol proceeded efficiently using in situ generated trimethylsilyl iodide. Coupling with Grignard reagents and other nucleophiles delivered (2Z)-2-iodo allylicalcohols. The geometry of the products was established by nOe.