Various kinds of nonbranched and methyl-branched 6-deoxyhex-5-enopyranoside derivatives were prepared from 6-bromo-6-deoxy or 6-O-p-tolylsulfonylhexopyranoside in a one-pot procedure by a successive treatment with iodide anion and 1,8-diazabicyclo[5.4.0]undec-7-ene in dimethyl sulfoxide. The scope and limitations of this reaction have become apparent by observing the reactions of 18 substrates. The yields of altropyranoside and 2-deoxyribo-hexopyranoside derivatives were high, except for the 2,3-anhydropyranoside derivative. Methyl-branched 6-deoxyhex-5-enopyranoside derivatives were also obtained in practical yields.
各种非分支和
甲基分支的6-
脱氧己-5-
烯吡喃苷衍
生物是通过将6-
溴-6-
脱氧或6-O-对
甲苯磺酰己
吡喃苷与
碘离子及
1,8-二氮杂双环[5.4.0]十一
烯在
二甲基亚砜中进行连续处理,采用一锅法制备的。通过观察18种底物的反应,这一反应的范围和局限性变得明显。除了2,3-无
水吡喃苷衍
生物外,其他的反应产物(如altropyranoside和
2-脱氧核糖己
吡喃苷衍
生物)产率较高。
甲基分支的6-
脱氧己-5-
烯吡喃苷衍
生物也以实用的产率获得。