Microwave-assisted Suzuki–Miyaura couplings on α-iodoenaminones
摘要:
A systematic study of alpha-iodination and subsequent Suzuki-Miyaura couplings between non-attenuated enaminones and a wide range of aromatic boronic acids is reported. The microwave-assisted variant of this transformation furnished the alpha-arylenaminones in significantly shorter reaction times and slightly improved yields as compared to conventional heating. (C) 2007 Elsevier Ltd. All rights reserved.
Amino Acid-Derived Enaminones: A Study in Ring Formation Providing Valuable Asymmetric Synthons
摘要:
A new reaction for the preparation of enaminones has been discovered. This method employs beta-amino acids as starting materials to allow diversification as well as incorporation of chirality. The beta-amino acids, once converted to ynones, are readily cyclized to the desired six-membered enaminone via a two-step, one-pot protocol. Although disguised as a 6-endo-dig cyclization, the reagents employed in the transformation play a direct role in bond making and bond breaking, thus changing the mode of addition.
lithium amides by oxidation with simple ketone oxidants, are readily alkylated with a range of enolates to provide mono- and polycyclic β-aminoketones in a single operation, including the natural product (±)-myrtine. Nitrile anions also serve as competent nucleophiles in these transformations, which are promoted by BF3 etherate. β-Aminoesters derived from esterenolates can be converted to the corresponding
Amino Acid-Derived Enaminones: A Study in Ring Formation Providing Valuable Asymmetric Synthons
作者:Brandon J. Turunen、Gunda I. Georg
DOI:10.1021/ja0609046
日期:2006.7.1
A new reaction for the preparation of enaminones has been discovered. This method employs beta-amino acids as starting materials to allow diversification as well as incorporation of chirality. The beta-amino acids, once converted to ynones, are readily cyclized to the desired six-membered enaminone via a two-step, one-pot protocol. Although disguised as a 6-endo-dig cyclization, the reagents employed in the transformation play a direct role in bond making and bond breaking, thus changing the mode of addition.
Microwave-assisted Suzuki–Miyaura couplings on α-iodoenaminones
作者:Xin Wang、Brandon J. Turunen、Matthew W. Leighty、Gunda I. Georg
DOI:10.1016/j.tetlet.2007.10.078
日期:2007.12
A systematic study of alpha-iodination and subsequent Suzuki-Miyaura couplings between non-attenuated enaminones and a wide range of aromatic boronic acids is reported. The microwave-assisted variant of this transformation furnished the alpha-arylenaminones in significantly shorter reaction times and slightly improved yields as compared to conventional heating. (C) 2007 Elsevier Ltd. All rights reserved.