Palladium-Catalyzed Asymmetric 1,6-Addition of Diarylphosphines to Allylidenemalonates for Chiral Phosphine Synthesis
作者:Wei-Liang Duan、Xu Wei、Junzhu Lu
DOI:10.1055/s-0035-1562456
日期:——
Abstract A pincer-palladium-catalyzed asymmetric 1,6-addition of diarylphosphines to allylidenemalonates has been developed for the synthesis of chiral allylic phosphines with up to 89% ee under mild conditions. A pincer-palladium-catalyzed asymmetric 1,6-addition of diarylphosphines to allylidenemalonates has been developed for the synthesis of chiral allylic phosphines with up to 89% ee under mild
A copper-catalyzed regioselective 1,4- and 1,6-conjugate addition of a silyl reagent to diendioates was established. Various 1,4- and 1,6-protosilylation products were obtained in good yields and with high regioselectivity via tuning the ligands used in the reactions. This protocol has provided a simple and efficient method for the synthesis of multisubstituted functionalized allylsilanes.
Lipase-catalyzed Knoevenagel condensation between α,β-unsaturated aldehydes and active methylene compounds
作者:Zhi Wang、Chun-Yu Wang、Hao-Ran Wang、Hong Zhang、Ya-Lun Su、Teng-Fei Ji、Lei Wang
DOI:10.1016/j.cclet.2014.03.036
日期:2014.5
A simple and efficient Knoevenagel condensation between α,β-unsaturatedaldehydes and active methylene compounds is reported. Notably, this condensation can be catalyzed by PPL (lipase from porcine pancreas) with satisfied yields (49%–92%). Moreover, PPL induces moderate Z/E selectivity in the Knoevenagel condensation.
A novel olefination of diazo-compounds with carbonyl compounds mediated by tributylstibine and catalytic amount of Cu(I)I
作者:Yi Liao、Yao-Zeng Huang
DOI:10.1016/s0040-4039(00)97988-7
日期:1990.1
A one-pot reaction of tributylstibine, diazo-compounds including dimethyldiazomalonate, ethyl diazoacetate and diazoacetylacetone, carbonyl compounds and catalytic amount of Cu(I)I resulted in olefination in high yields.
4‐(Dimethylamino)Pyridinium Azide in Protic Ionic Liquid Media as a Stable Equivalent of Hydrazoic Acid
作者:Ivan A. Andreev、Maksim A. Boichenko、Nina K. Ratmanova、Olga A. Ivanova、Irina I. Levina、Victor N. Khrustalev、Igor A. Sedov、Igor V. Trushkov
DOI:10.1002/adsc.202200486
日期:2022.7.19
We report a procedure for the multigram synthesis of 4-(dimethylamino)pyridinium azide, a stable, non-explosive, low-hygroscopic source of azide ion soluble in both protic and aprotic organic solvents. In protic ionicliquid media this reagent was shown to serve as a safer equivalent of toxic and unstable hydrazoic acid. The synthetic utility of this system was demonstrated using donor-acceptor cyclopropane