this communication we report the use of (±)-norephedrine and (−)-8-benzylaminomenthol (derived from (+)-pulegone) as chiral adjuvants for the cycloaddition of α,β-unsaturated 1,3-dipolarophiles. 2-Isoxazolines were obtained with low stereoselectivity from the reaction of nitrile oxides with the N-tosyl norephedrine derivative as the dipolarophile. Cycloaddition of nitrile oxide with 2-vinyl-N-benzyl-4
在本交流中,我们报道了使用(±)-去氧
麻黄碱和(-)-8-苄基
氨基薄荷醇(来自(+)-pulegone)作为手性佐剂,用于环加成α,β-不饱和1,3-双极性亲和剂。从异腈氧化物与N-
甲苯磺酰基去氧
麻黄碱衍
生物作为双极性亲和剂的反应中,以低的立体选择性获得2-
异恶唑啉。
一氧化氮与2-
乙烯基-N-苄基-4,4,7α-三甲基-反-八氢-1,3-苯并恶嗪的环加成反应产生立体异构体2-
异恶唑啉,比例约为95:5。