The catalytic C–H silylation of sulfides with hydrosilanes is of much interest and importance but has remained unexplored to date. We report here the C–H silylation of methylsulfides with hydrosilanes by an yttrium metallocene catalyst. The reaction took place regioselectively at the α-methyl C–H bond, affording the corresponding silylated sulfide derivatives that are difficult to make by other means
α-C—H Alkylation of Methyl Sulfides with Alkenes by a Scandium Catalyst
作者:Yong Luo、Yuanhong Ma、Zhaomin Hou
DOI:10.1021/jacs.7b11245
日期:2018.1.10
addition of sulfides to alkenes is an atom-efficient route for the functionalization and modification of sulfide compounds through C-C bond formation, but this transformation is highly challenging. We report here the regioselective α-C(sp3)-H addition of a wide range of methyl sulfides to a variety of olefins and dienes by a half-sandwich scandium catalyst. This protocol provides a unique route for the synthesis
硫化物与烯烃的 CH 加成是通过形成 CC 键对硫化物化合物进行官能化和改性的一种原子有效途径,但这种转化极具挑战性。我们在这里报告了通过半夹心钪催化剂将多种甲基硫化物区域选择性地加成到各种烯烃和二烯中的 α-C(sp3)-H。该协议为通过在硫相邻碳原子上以 100% 原子效率的方式形成 CC 键来合成多种硫化物衍生物提供了独特的途径。
Preparation of Stereodefined Secondary Alkyllithium Compounds
We have developed a practical stereoretentive iodine/lithium‐exchange process that allows the stereodefined preparation of cis‐ and trans‐cycloalkyllithium compounds from their corresponding stereodefined iodides. Quenching with electrophiles offers stereospecific access to both cis‐ (up to 96 % cis) and trans‐cycloalkyl derivatives (up to 99 % trans). A detailed study of the thermodynamic stabilities