1,3-Dipolar Cycloaddition Reaction of <scp>d</scp>-Glucose-Derived Nitrone with Allyl Alcohol: Synthesis of 2-Hydroxy-1-deoxycastanospermine Analogues
作者:Narayan S. Karanjule、Shankar D. Markad、Tarun Sharma、Sushma G. Sabharwal、Vedavati G. Puranik、Dilip D. Dhavale
DOI:10.1021/jo048176x
日期:2005.2.1
The synthesis and evaluation of glycosidase inhibitory activity of polyhydroxylated indolizidine alkaloids namely 2-hydroxy-1-deoxycastanospermine 3a,b and 2-hydroxy-1-deoxy-8a-epi-castanospermine 3c,d is reported. The key step involves the intermolecular 1,3-dipolar cycloaddition of allyl alcohol to d-glucose-derived nitrone 4, followed by tosylation, that afforded four diastereomeric sugar-substituted
据报道,多羟基化的吲哚唑烷生物碱2-羟基-1-脱氧castanospermine 3a,b和2-羟基-1-脱氧-8a - epi - castanospermine 3c,d的糖苷酶抑制活性的合成和评价。关键步骤涉及烯丙醇在分子间的1,3-偶极环加成到d-葡萄糖衍生的硝酮4,然后进行甲苯磺酰化,得到四个具有所需区域选择性的非对映体糖取代的异恶唑烷5a - d。从5a - d到吡咯烷8a - d的一锅转换通过氢解,除去1,2-丙酮酸官能度,并氢化得到相应的靶分子3a - d。