The transition‐metal‐catalyzed C−P bond cleavage has emerged as a powerful tool for the formation of both C−C and C−P bond. However, the transition‐metal‐catalyzed stereoselective cleavage of C−P bond is still undeveloped. Herein, we report a palladium‐catalyzed stereoselective cleavage of C−P bond for the construction of P‐stereogenic phosphines and stereogenic axis. This protocol enables the quick synthesis of atropisomers bearing a P‐stereogenic center in high yields, diastereo‐ and enantioselectivities of up to 98 % ee, >25 : 1 dr. The product is able to serve as chiral catalyst in phosphine catalyzed [3+2] cycloaddition of allenoates to imines, showing the great potential of the present methodology.
A mild and efficient method for cobalt-catalyzed hydroxyperfluoroalkylation of alkenes has been developed. This method demonstrated broad substrate scope, good yields, and mild conditions with the tolerance of mono-, di-, and trisubstituted alkenes including both styrenes and non-activated aliphatic olefins. This strategy offered a valuable solution for rapid and efficient construction of β-perfluoroalkyl alcohols using widely available and inexpensive perfluoroalkyl bromides and atmospheric oxygen.
Chiral monodentate biaryl phosphines (MOPs) have attracted intense attention as chiral ligands over the past decades. However, the creation of structurally diverse chiral MOPs with both P- and axial chirality is still in high demand but challenging. Here, we show a distinct strategy for diversity-oriented synthesis of structurally diverse MOPs containing both P- and axial chirality enabled by enantioselective C-P bond cleavage. The key chiral PdII intermediates, generated through the stereoselective oxidative addition of C-P bond, could be trapped by alkynes, R3Si-Bpin, diboron esters or reduced by H2O/B2pin2, leading to enantioenriched structurally diverse MOPs in excellent diastereo- and enantioselectivities. Based on the outstanding properties of the parent scaffolds, the P- and axially chiral monodentate biaryl phosphines serve as excellent catalysts in asymmetric [3 + 2] annulation of MBH carbonate affording the chiral functionalized bicyclic imide.
The transition-metal-catalyzed CÀ P bond cleavage has emerged as a powerful tool for the formation of both CÀ C and CÀ P bond. However, the transition-metal-catalyzed stereoselective cleavage of CÀ P bond is still undeveloped. Herein, we report a palladium-catalyzed stereoselective cleavage of CÀ P bond for the construction of P-stereogenic phosphines and stereogenic axis. This protocol enables the quick synthesis of atropisomers bearing a P-stereogenic center in high yields, diastereo-and enantioselectivities of up to 98 % ee, > 25 : 1 dr. The product is able to serve as chiral catalyst in phosphine catalyzed [3+2] cycloaddition of allenoates to imines, showing the great potential of the present methodology.
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