Highly Diastereoselective Radical Addition to Oxime Ethers: Asymmetric Synthesis of β-Amino Acids
摘要:
[GRAPHICS]Highly diastereoselective alkyl radical addition to Oppolzer's camphorsultam derivatives of oxime ethers provided a convenient method for preparing the enantiomerically pure alpha,beta-dialkyl-beta-amino acids. The phase-transfer-catalyzed alkylation was an excellent method for the selective monoalkylation of the N-(beta-oximino)acyl derivative of Oppolzer's sultam, with no detection of dialkylated products. In the presence of BF3. OEt2, the carbon radical addition to the oxime ethers proceeded smoothly to give the alpha,beta-dialkyl-beta-amino acid derivatives with excellent diastereoselectivity.
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 radicaladdition to chiral oxime ethers was studied with a view to preparing enantiomerically pure alpha,beta-dialkyl-beta-amino acidderivatives. 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, radicaladdition to the oxime
Highly Diastereoselective Radical Addition to Oxime Ethers: Asymmetric Synthesis of β-Amino Acids
作者:Hideto Miyabe、Kayoko Fujii、Takeaki Naito
DOI:10.1021/ol990688o
日期:1999.8.1
[GRAPHICS]Highly diastereoselective alkyl radical addition to Oppolzer's camphorsultam derivatives of oxime ethers provided a convenient method for preparing the enantiomerically pure alpha,beta-dialkyl-beta-amino acids. The phase-transfer-catalyzed alkylation was an excellent method for the selective monoalkylation of the N-(beta-oximino)acyl derivative of Oppolzer's sultam, with no detection of dialkylated products. In the presence of BF3. OEt2, the carbon radical addition to the oxime ethers proceeded smoothly to give the alpha,beta-dialkyl-beta-amino acid derivatives with excellent diastereoselectivity.