Synthesis of<i>N</i>,<i>N</i>,<i>O</i>-Trisubstituted Hydroxylamines by Stepwise Reduction and Substitution of<i>O</i>-Acyl<i>N</i>,<i>N</i>-Disubstituted Hydroxylamines
作者:Sandeep Dhanju、David Crich
DOI:10.1021/acs.orglett.6b00556
日期:2016.4.15
Diverse N,N,O-trisubstituted hydroxylamines, an under-represented group in compound collections, are readily prepared by partial reduction of N-acyloxy secondary amines with diisobutylaluminum hydride followed by acetylation and reduction of the so-formed O-acyl-N,N-disubstituted hydroxylamines with triethylsilane and boron trifluoride etherate. Use of carbon nucleophiles in the last step, including
通过用二异丁基氢化铝部分还原N-酰氧基仲胺,然后进行乙酰化和还原形成的O-酰基-N,可以很容易地制备出多种N,N,O-三取代的羟胺(化合物集合中代表性不足的基团)。N-二取代羟胺与三乙基硅烷和三氟化硼醚化物。在最后一步中使用碳亲核试剂,包括烯丙基三丁基锡烷,甲硅烷基烯醇醚和2-甲基呋喃,可得到N,N,O-三取代的羟胺,其支链α-至O-取代基。ñ通过使仲胺与过氧化二苯甲酰反应,然后使氢化二异丁基铝还原,可以方便地制备N-二取代的羟胺。