Selective Protecting Method for the Individual Hydroxyl Groups of Kdn
作者:
Shoji Akai,
Takahiro Nakagawa,
Yasuhiro Kajihara,
Ken-ichi Sato,
期刊:
Journal of Carbohydrate Chemistry
(Taylor Available online 1999)
卷期:
Volume 18,
issue 6
页码: 639-654
ISSN:0732-8303
年代: 1999
DOI:10.1080/07328309908544026
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Selective protection for the individual hydroxyl groups of methyl (phenyl 3-deoxy-2-thio-β-D-glycero-D-galacto-2-nonulopyranosid)onate (2) was examined. The 4-, 5-, and 7-hydroxyl groups of methyl (phenyl 3-deoxy-8,9-O-isopropylidene-2-thio-β-D-glycero-D-galacto-2-nonulopyranosid)onate (3) were found selectively to be protected byt-butyldimethylsilyl, methoxymethyl, and benzoyl groups, respectively. In order to obtain the 8- and 9-hydroxyl derivatives selectively, methyl (phenyl 4,5,7-tri-O-acetyl-9-O-t-butyldimethylsilyl-3-deoxy-2-thio-β-D-glycero-D-galacto-2-nonulopyranosid)onate (12) and methyl (phenyl 4,5,7,8-tetra-O-benzyl-9-O-triphenylmethyl-3-deoxy-2-thio-β-D-glycero-D-galacto-2-nonulopyranosid)onate (19) were prepared in moderate yields.
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