A versatile synthesis of 1,2,3-triazolyl-4-phosphines from the borane complexes of phosphino-alkynes is reported. The efficiency of the procedure relies on the use of readily available silyl-protected alkynylphosphine-boranes, which were subjected to desilylation with TBAF followed by copper-catalyzed azide–alkyne-cycloaddition in one pot. Subsequent treatment with DABCO afforded the targeted triazolylphosphines in high yields. The reported method was applied to the synthesis of the first example of an enantioenriched P-stereogenic triazolylphosphine (98.8% ee).
Synthesis of<i>Z</i>-Alkenyl Phosphorus Compounds through Hydroalumination and Carbocupration of Alkynyl Precursors
作者:Stéphanie Ortial、Jean-Luc Montchamp
DOI:10.1021/ol2010374
日期:2011.6.17
The stereocontrolled synthesis of Z-alkenylphosphine-borane complexes is easily accomplished via the hydroalumination or carbocupration of alkynyl precursors. Z/E ratios are generally higher than 95/5. These reactions are stereocomplementary to our olefination approach.