Fragmentation of Carbohydrate Anomeric Alkoxy Radicals. Synthesis of Polyhydroxy Piperidines and Pyrrolidines Related to Carbohydrates
作者:Cosme G. Francisco、Raimundo Freire、Concepción C. González、Elisa I. León、Concepción Riesco-Fagundo、Ernesto Suárez
DOI:10.1021/jo0057452
日期:2001.3.1
xoses, 6-amino-6-deoxyfuranohexoses, and 6-amino-6-deoxypyranohexoses undergo a tandem alkoxy radical beta-fragmentation-intramolecular cyclization reaction. The reaction is promoted by the system: iodosylbenzene-iodine under mild conditions. The tert-butoxycarbonyl, benzyloxycarbonyl, and diphenylphosphinoyl radicals have been studied as amino-protecting groups. Using this methodology, polyhydroxylated
当受保护的5-氨基-5-脱氧呋喃戊糖,5-氨基-5-脱氧呋喃己糖,6-氨基-6-脱氧呋喃己糖和6-氨基-6-脱氧吡喃己糖经串联烷氧基氧化时,可以具体获得哌啶和吡咯烷类型的氨基糖。自由基β-片段化-分子内环化反应。该反应由以下系统促进:碘基苯碘在温和的条件下。已经研究了叔丁氧基羰基,苄氧基羰基和二苯基膦酰基作为氨基保护基。使用该方法,获得了D-呋喃呋喃糖酶34和35,D-苏呋喃糖36,L-木呋喃糖42和D-阿拉伯呋喃糖43系列的多羟基吡咯烷和D-阿拉伯吡喃型葡萄糖37和38的多羟基哌啶。