Trichloroacetimidate method condensation

High a-selectivities were observed when the D-galactosyl donor 10 was used for the coupling with secondary hydroxy groups in carbohydrate acceptors including 9 (see Scheme 5). With the trichloroacetimidate method [5], the yields of disaccharides derived from 6 and 7 were 85% (10 1, a/p) and 87% (only a), respectively. The condensation of 10... 

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