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  • Enantiodivergent Formation of C-P Bonds: Synthesis of P-Chiral Phosphines and Methylphosphonate Oligonucleotides.

Enantiodivergent Formation of C-P Bonds: Synthesis of P-Chiral Phosphines and Methylphosphonate Oligonucleotides.

Journal of the American Chemical Society (2020-02-29)
Dongmin Xu, Nazaret Rivas-Bascón, Natalia M Padial, Kyle W Knouse, Bin Zheng, Julien C Vantourout, Michael A Schmidt, Martin D Eastgate, Phil S Baran
ABSTRACT

Phosphorus Incorporation (PI, abbreviated Π) reagents for the modular, scalable, and stereospecific synthesis of chiral phosphines and methylphosphonate nucleotides are reported. Synthesized from trans-limonene oxide, this reagent class displays an unexpected reactivity profile and enables access to chemical space distinct from that of the Phosphorus-Sulfur Incorporation reagents previously disclosed. Here, the adaptable phosphorus(V) scaffold enables sequential addition of carbon nucleophiles to produce a variety of enantiopure C-P building blocks. Addition of three carbon nucleophiles to Π, followed by stereospecific reduction, affords useful P-chiral phosphines; introduction instead of a single methyl group reveals the first stereospecific synthesis of methylphosphonate oligonucleotide precursors. While both Π enantiomers are available, only one isomer is required-the order of nucleophile addition controls the absolute stereochemistry of the final product through a unique enantiodivergent design.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
(+)-PI Reagent, ≥95%
Sigma-Aldrich
(−)-PI Reagent, ≥95%
Sigma-Aldrich
Methyl (-)-PI Reagent, ≥95%
Sigma-Aldrich
Methyl (+)-PI Reagent, ≥95%
Sigma-Aldrich
trans-(-)-limonene oxide, ≥95%
Sigma-Aldrich
trans-(+)-limonene oxide