作者:Lu Yan、Yan Meng、Fredrik Haeffner、Robert M. Leon、Michael P. Crockett、James P. Morken
DOI:10.1021/jacs.7b12316
日期:2018.3.14
A mechanistic investigation of the carbohydrate/DBU cocatalyzed enantioselective diboration of alkenes is presented. These studies provide an understanding of the origin of stereoselectivity and also reveal a strategy for enhancing reactivity and broadening the substrate scope.
Diols, α-Ketols, and Diones as 2<sub>2π</sub> Components in [2+2+2] Cycloadditions of 1,6-Diynes via Ruthenium(0)-Catalyzed Transfer Hydrogenation
作者:Hiroki Sato、Matthias Bender、Weijie Chen、Michael J. Krische
DOI:10.1021/jacs.6b11746
日期:2016.12.21
The first use of vicinal diols, ketols, or diones as 2(2 pi) components in metal-catalyzed [2+2+2] cycloaddition is described. Using ruthenium(0) catalysts, 1,6-diynes form ruthenacyclopentadienes that engage transient diones in successive carbonyl addition. Transfer hydrogenolysis of the resulting ruthenium(II) diolate mediated by the diol or ketol reactant releases the cycloadduct with regeneration of ruthenium(0) and the requisite dione.
New homochiral cyclic diol ligands for titanium alkoxide catalyzed phosphonylation of aldehydes
作者:Michael D. Groaning、Bradley J. Rowe、Christopher D. Spilling
DOI:10.1016/s0040-4039(98)01139-3
日期:1998.7
An investigation of the structural effects of chiral diol ligands on the enantioselectivity of phosphorylation was performed. Cyclic diols, and cyclohexanediol in particular, were identified as effective ligands for titanium alkoxide catalyzed asymmetric phosphorylation. (C) 1998 Elsevier Science Ltd. All rights reserved.