<i>anti</i>-Dioxylation of Cyclohex-4-ene-1,2-diamine Derivatives: Asymmetric Routes to Hydroxy- and Amino-Substituted Cyclohexane and 7-Azanorbornane
作者:Diego Savoia、Davide Balestri、Stefano Grilli、Magda Monari
DOI:10.1002/ejoc.201301700
日期:2014.3
of sulfonate or carboxylate anions. The two procedures, after basic quenching and reductive removal of the N-substituents, provide stereoselective access to 2-exo-5-endo-5-amino-7-azabicyclo[2.2.1]heptan-2-ol and 4,5-diaminocyclohexane-1,2-diol, respectively. The different outcomes are explained by differing chair conformations of the protonated diamine-epoxide intermediates, which undergo ring opening
(1R,2R)-1,2-双[(1S)-苯乙氨基]环己烯的高度非对映选择性抗二氧化是通过双键与间氯过苯甲酸(mCPBA)在磺酸或三卤乙酸存在下的环氧化来完成的在磺酸根或羧酸根阴离子的存在下,环氧化物的酸和开环原位。在基本淬灭和还原性去除 N 取代基后,这两个过程提供了对 2-exo-5-endo-5-amino-7-azabicyclo[2.2.1]heptan-2-ol 和 4,5- 的立体选择性访问二氨基环己烷-1,2-二醇,分别。不同的结果可以通过质子化二胺-环氧化物中间体的不同椅子构象来解释,这些中间体通过优选的反双轴机制进行开环。