Rearrangement Reactions Leading to Optically Active α,α-Disubstituted Primary Allylamines
作者:Martin Hennum、Hege Hortemo Odden、Lise-Lotte Gundersen
DOI:10.1002/ejoc.201601446
日期:2017.1.26
Synthetic routes to α,α-disubstituted allylamines have been examined. Racemic compounds were conveniently prepared by thermal Overman rearrangements of primary allyl alcohols with trisubstituted double bonds, but rearrangement of these substrates by the only commercially available compound known to catalyze enantioselective Overman rearrangements, the cobalt oxazoline palladacycle (R)-COP-Cl, failed
已经研究了 α,α-二取代烯丙胺的合成路线。外消旋化合物可通过具有三取代双键的伯烯丙醇的热 Overman 重排方便地制备,但通过已知可催化对映选择性 Overman 重排的唯一市售化合物,钴恶唑啉钯环 (R)-COP-Cl 对这些底物进行重排失败。相反,通过 CBS 介导的相应甲基酮还原获得的具有三取代双键的光学活性仲烯丙醇被合成并通过热 Overman 重排或烯丙酯到异氰酸酯重排转化为 α,α-二取代烯丙胺。两个反应序列都获得了高手性转移 (90-99%),