Triisopropyl phosphite → HCID 54076213, compound

Participants

Reaction Steps

21.2 g (63.1 mmol) of ethyl 6-acetoxy-4-bromomethyl-2(R)-formylamino-hex-3-enoate and 69.1 ml (252.2 mmol) of 90% triisopropyl phosphite are heated to 80° C. and the mixture is stirred for 18 hours under a pressure of 100-150 mbar. Excess triisopropyl phosphite is removed by distillation and the residue is purified by flash chromatography on silica gel with ethyl acetate/ethanol (19:1), giving 8.6 g of ethyl 6-acetoxy-2(R)-formylamino-4-diisopropylphosphonomethyl-hex-3-enoate a yellowish-orange oil. ee=92.5%; αD -90.2°±0.4° (c=2.84 CH2Cl2).

Provenance & Evidence