challenge. Here we show that these compounds can be efficiently accessed by using a palladium/Xiao‐Phos catalytic system, which leads to the highly regioselective formation of the anti‐Markovnikov adducts through addition of a secondary phosphine oxide to an alkyne. Diverse (hetero)aryl and alkyl alkynes, as well as both terminal and internal alkynes can be employed as substrates. The kinetic resolution process
Structural effects in reactions of organophosphorus compounds. II. Reaction of Grignard reagents with phosphonic dichlorides
作者:Alfred D. Brown、Gennady M. Kosolapoff
DOI:10.1039/j39680000839
日期:——
It has been shown that the reaction of Grignardreagents containing tertiary aliphatic radicals with phosphonicdichlorides may yield as many as four products, depending on the nature of the reactants. Some of these products are described for the first time.
Asymmetric Library Synthesis of P-Chiral <i>t</i>-Butyl-Substituted Secondary and Tertiary Phosphine Oxides
作者:Shi-Guang Li、Minglei Yuan、Filip Topic、Zhengxu S. Han、Chris H. Senanayake、Youla S. Tsantrizos
DOI:10.1021/acs.joc.9b00945
日期:2019.6.7
An asymmetricsynthesis, amenable to library preparation of structurally diverse P-chiral t-butyl substituted secondary phosphine oxides (SPOs) and tertiary phosphine oxides (TPOs), was developed. A P-chiral H-phosphinate building block was prepared via a two-step, one-pot condensation of a chiral auxiliary with t-BuPCl2, followed by hydrolysis. Nucleophilic displacement of the chiral auxiliary with
bearing a tert -butyl(methyl)phosphino group are important for the preparation of several commonly used diphosphine ligands. However, previously reported synthetic methods used hazardous starting materials and are difficult to operate. In order to overcome these limitations, a new and convenient synthesis for a number of P-stereogenic intermediates possessing a tert -butyl(methyl)phosphino group has