Three-Component Asymmetric Mannich Reaction Catalyzed by a Lewis Acid with Rhodium-Centered Chirality
作者:Lihe Feng、Xuemei Dai、Eric Meggers、Lei Gong
DOI:10.1002/asia.201700189
日期:2017.5.4
A highly efficient direct asymmetric three‐component Mannich reaction of an N‐acylpyrazole, an aldehyde and a primary or secondary amine, was enabled by a rhodium‐based Lewis‐acid catalyst with metal‐centered chirality. Excellent enantioselectivities were achieved for a variety of substrates at a typical catalyst loading of merely 0.5 mol % (23 examples, up to 98 % ee).
铑基路易斯酸催化剂具有金属中心手性,可实现N-酰基吡唑,醛与伯胺或仲胺的高效直接不对称三组分曼尼希反应。在典型的催化剂负载量仅为0.5 mol%的情况下,多种底物均具有出色的对映选择性(23个实例,至多98%ee)。