Fused Triazoles via Tandem Reactions of Activated <i>Cinchona</i> Alkaloids with Azide Ion. Second <i>Cinchona</i> Rearrangement Exemplified
作者:S. Röper、M. H. Franz、R. Wartchow、H. M. R. Hoffmann
DOI:10.1021/ol034719y
日期:2003.8.1
[reaction: see text] Intramolecular 1,3-dipolar cycloadditions of cinchona azides to the C10-C11 alkyne and C10-C11 olefin unit of the alkaloid have been designed via tandem strategy. A variety of fused triazoles and triazolines with a bis-azahomotwistane skeleton have been prepared. In trifluoroethanol, O-mesylcinchonidine 7-OMs and NaN(3) furnish triazole 8 as well as cage-expanded 1,5-diazatricyclo[4
[反应:见正文]通过串联策略设计了金鸡纳叠氮化物的分子内1,3-偶极环加成反应到生物碱的C10-C11炔烃和C10-C11烯烃单元上。已经制备了具有双氮杂高硫烷骨架的各种稠合的三唑和三唑啉。在三氟乙醇中,O-甲磺酰基可可宁7-OMs和NaN(3)提供三唑8以及笼扩展的1,5-二氮杂三环[4.4.1.0(3,8)]十一烷衍生物10。形成了稠合的三唑8和10。分别保留了C9和C3的配置。1-氮杂双环[3.2.2]笼的扩展被证明是可逆的。