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6<i>R</i>/<i>S</i>-deutero-&#945;-<span style="font-variant: small-caps;">d</span>-mannopyranoside 1-phosphate was synthesised from a C6 aldehydic mannose thioglycoside donor in four steps. Using NaBD₄ as the reductant, isotopic enrichment at C6 was achieved and the resultant C6-deuterated material was converted through to the glycosyl 1-phosphate using a protection/glycosylation/deprotection sequence. The product was fully characterised by ¹H, ¹³C, ³¹P and 2D NMR, alongside MS analysis.