New P-Chiral Phosphates, Phosphorothioates and Phosphoroselenothioates

References

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• Sp,Sc)-14, |α|D-82.3° (c 3.23, CHCl3) was dissolved in dioxane and treated with sodium hydride (20% molar excess) under rigorously anhydrous conditions. After two hours the reaction mixture was treated with triethylamnonium acetate buffer (pH 7) and organic compounds were extracted with CHCl3. After standard work-up recovered (Sp,Sc)-14 was isolated by means of column chromatoraphy on silica-gel, m.p. 128-130°C, |α|D-78.5° (c 1.04, CHCl3
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• 31P n.m.r. spectra recorded for reaction mixtures under the conditions of PN→PX conversion did not contain any signals corresponding to pentacoordinated intermediates of type 4 or 4-membered cyclic intermediates of type 7 or 8
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