Abstract
We investigated the coupling reaction of glycosyl donors N-trichloroethoxycarbonyl-galactosamine- O-trichloroacetimidate ( 2a) and N- p-nitrobenzyloxycarbonyl-galactosamine- O-trichloroacetimidate ( 2b) with the 4′-OH of lactose derivatives ( 3a– d) to synthesize key intermediates of asialo GM2 analogues, and found that the glycosylation yield with 2a was 90% or more in all investigated cases.
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