Radical addition to oxime ethers for asymmetric synthesis of β-amino acid derivatives
作者:Hideto Miyabe、Kayoko Fujii、Takeaki Naito
DOI:10.1039/b208823a
日期:2003.1.13
The diastereoselective alkyl radical addition to chiral oxime ethers was studied with a view to preparing enantiomerically pure alpha,beta-dialkyl-beta-amino acid derivatives. The phase transfer-catalyzed alkylation of Oppolzer's camphorsultam derivative of oxime ether proceeded smoothly to give the alkylated N-(beta-oximino)acyl derivatives. In the presence of BF3.OEt2, radical addition to the oxime
为了制备对映体纯的α,β-二烷基-β-氨基酸衍生物,研究了向手性肟醚中的非对映选择性烷基的加成。肟醚的Oppolzer's樟脑素衍生物的相转移催化的烷基化反应进行得很顺利,得到了烷基化的N-(β-肟基)酰基衍生物。在BF3.OEt2的存在下,使用三乙基硼烷作为自由基引发剂,向肟醚中进行自由基加成,从而得到具有出色的非对映选择性的α,β-二烷基-β-氨基酸衍生物。