Syntheses of Dihydroconduramines (±)-B-1, (±)-E-1, and (±)-F-1 via Diastereoselective Epoxidation of N-Protected 4-Aminocyclohex-2-en-1-ols
作者:Méabh B. Brennan、Kristína Csatayová、Stephen G. Davies、Ai M. Fletcher、William D. Green、James A. Lee、Paul M. Roberts、Angela J. Russell、James E. Thomson
DOI:10.1021/acs.joc.5b00716
日期:2015.7.2
resulted in initial formation of the corresponding N-oxide, followed by epoxidation on the face syn to the hydroxyl group exclusively; reduction then provided either (1RS,2RS,3SR,4RS)- or an alternative route to (1RS,2RS,3SR,4SR)-2,3-epoxy-4-N,N-dibenzylaminocyclohexan-1-ol, respectively. In all cases, SN2-type ring opening of these epoxides upon treatment with aqueous H2SO4 proceeded by nucleophilic attack
通过两个互补的方法,由N保护的4-氨基环己基-2-烯-1-醇完成了对二氢conduramines(±)-B-1,(±)-E-1和(±)-F-1的非对映选择性合成环氧化是关键步骤。任一的治疗反式-或顺式-4- ñ -benzylaminocyclohex -2-烯-1-醇被Cl 3 CCO 2 H和然后中号氯过氧苯甲酸(米-CPBA)导致初始形成相应的铵物种,接着脸上的环氧化仅与铵部分合成;然后提供(1 RS,2 SR,3 RS,4 RS)-或(1RS,2 RS,3 SR,4 SR)-2,3-环氧-4 - N,N-二苄基氨基环己-1-醇。用m -CPBA处理反式或顺式-4- N,N-二苄氨基氨基环己-2--2-烯-1-醇会导致初始形成相应的N-氧化物,然后仅与羟基同在环上进行环氧化; 然后提供(1 RS,2 RS,3 SR,4 RS)-或(1 RS,2 RS,3SR,4 SR)-2,3-环氧-4-