Organocatalytic Michael Addition of Unactivated α-Branched Nitroalkanes to Afford Optically Active Tertiary Nitrocompounds
作者:Beñat Lorea、Ane García-Urricelqui、José M. Odriozola、Jesús Razkin、Maialen Espinal-Viguri、Mikel Oiarbide、Antonia Mielgo、Jesús M. García、Claudio Palomo
DOI:10.1021/acs.orglett.3c03340
日期:2023.12.8
The direct, asymmetric conjugate addition of unactivated α-branched nitroalkanes is developed based on the combined use of chiral amine/ureidoaminal bifunctional catalysts and a tunable acrylate template to provide tertiary nitrocompounds in 55–80% isolated yields and high enantioselectivity (e.r. up to 96:4). Elaboration of the ketol moiety in thus obtained adducts allows a fast entry to not only
未活化 α-支化硝基烷烃的直接、不对称共轭加成是基于手性胺/脲醛胺双功能催化剂和可调丙烯酸酯模板的组合使用而开发的,可提供 55-80% 分离产率和高对映选择性(呃高达 96)的叔硝基化合物。 :4)。由此获得的加合物中酮醇部分的精制不仅可以快速进入羧酸和醛衍生物,还可以快速进入腈化合物和对映体富集的5,5-二取代的γ-内酰胺。