在中性反应条件下,用H 2 O 2进行的第一次锰催化的有机硅烷氧化为硅烷醇。可以耐受具有烷基,芳基,炔基和杂环取代基的多种有机硅烷,以及受阻位有机硅烷。氧化似乎是通过涉及氢过氧化锰物质的协同过程进行的。该方案具有温和的反应条件,快速的氧化作用,并且没有废副产物,可实现硅烷醇和硅烷二醇的低成本,生态友好的合成。
Copper-Catalyzed Desymmetrization of Prochiral Silanediols to Silicon-Stereogenic Silanols
作者:Jihui Gao、Pei-Lin Mai、Yicong Ge、Wei Yuan、Yingzi Li、Chuan He
DOI:10.1021/acscatal.2c02482
日期:2022.7.15
medicinal chemistry, and modern synthetic chemistry, the catalyticasymmetricsynthesis of which remains a considerable challenge compared with their carbinol analogues. Herein, a copper-catalyzed desymmetrization of silanediols for the synthesis of various functionalized chiral silanols is demonstrated. The reaction features highatomeconomy, decent yield with excellent stereoselectivity, and H2 as
Generation of Silicon-Centered Stereogenicity by Chiral Counteranion-Directed Desymmetrization of Silanediols
作者:Min Zhu、Martin Oestreich
DOI:10.1021/acscatal.3c02682
日期:2023.8.4
An enantiotopic group-selective monosilylation of silanediols using List’s counteranion-directed silylation methodology is reported. A silylium-ion-like silicon electrophile generated from an allylic silane paired with an imidodiphosphorimidate (IDPi) enables the enantioselective discrimination of the two hydroxy groups attached to the prochiral silicon atom. The enantioselectivity achieved in the
报道了使用 List 的反阴离子引导的甲硅烷基化方法对硅烷二醇进行对映基团选择性单甲硅烷基化。由烯丙基硅烷与亚氨基二磷酸酯 (IDPi) 配对生成的硅离子状硅亲电子试剂能够对连接到前手性硅原子的两个羟基进行对映选择性区分。通过随后的动力学拆分,进一步提高去对称步骤中实现的对映选择性,以获得具有高对映控制的硅立体二硅氧烷,以及少量的非手性三硅氧烷副产物。
Composition comprising a vinylidene polymer and a compound containing boron, oxygen and silicon in a ring structure