An Intramolecular [2 + 3] Cycloaddition Route to Fused 5-Heterosubstituted Tetrazoles
作者:Zachary P. Demko、K. Barry Sharpless
DOI:10.1021/ol010220x
日期:2001.12.1
[reaction: see text] Fused 5-heterotetrazole ring systems are synthesized in high yield via intramolecular [2 + 3] cycloadditions of organic azides and heteroatom-substituted nitriles. Cyanates, thiocyanates, and cyanamides are all competent dipolarophiles for this reaction. A variety of scaffolds are tolerated when the new enclosed ring is five- or six-membered.
[反应:见正文]通过有机叠氮化物和杂原子取代的腈的分子内[2 + 3]环加成反应,可以高产率合成熔融的5-杂四唑环系统。氰酸盐,硫氰酸盐和氰胺都是可胜任的双极性亲和剂。当新的封闭环为五元或六元环时,可以耐受各种支架。