Abstract:An efficient synthesis of lactones 5 and 6, known intermediates towards KDO and DAH, respectively, has been achieved by a short and highly efficient route. Homologation of protected Dmannose and D-arabinose was performed by a Peterson reaction with 2-lithio-2-trimethylsilyldithiane or the corresponding bis(methylsulfanyl) derivative, followed by the cyclization of the resulting ketene dithioacetal under very smooth conditions. An oxidative treatment with iodine gave the lactones 5 and 6 in a threestep sequence… Show more
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