... 0000, 00, 1 – 13 0000 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim ... Page 6. ... The two-step protocol gave better yield of nucleoside ana- logues in the case of acetophenone (20): 94% yield of 23b was obtained instead of 60% of 23a without depro- tection (Scheme 7B). ...