Enantioselective Organocatalytic One-Pot Amination/aza-Michael/Aldol Condensation Reaction Sequence: Synthesis of 3-Pyrrolines with a Quaternary Stereocenter
作者:Alaric Desmarchelier、Vincent Coeffard、Xavier Moreau、Christine Greck
DOI:10.1002/chem.201202024
日期:2012.10.8
Primary amine‐catalyzed direct conversion of α,α‐disubstituted aldehydes into 3‐pyrrolines with a quaternary stereocenter is reported. The one‐pot enantioselective sequence is based on a α‐amination, an aza‐Michael addition of hydrazine, an aldol condensation dehydratation and proceeds with good yields and excellent levels of enantioselectivity. Synthetically attractive applications including the formation
据报导伯胺催化的α,α-二取代醛直接转化为具有4-级立体中心的3-吡咯啉。一锅对映选择性序列基于α-氨基化,肼的氮杂-迈克尔加成,醛醇缩合脱水,并以良好的收率和优异的对映选择性进行。还描述了在合成上有吸引力的应用,包括形成具有良好产率和选择性的叠氮基吡咯烷或环氧吡咯烷衍生物。