Polyunsaturated Alkyl Amides from Echinacea: Synthesis of Diynes, Enynes, and Dienes
作者:Nicholas J. Matovic、Patricia Y. Hayes、Kerry Penman、Reginald P. Lehmann、James J. De Voss
DOI:10.1021/jo200289f
日期:2011.6.3
constructing alkyl amides containing conjugated diyne and isomerically pure enyne and diene moieties and may be adapted easily for the preparation of other alkyl amides present in Echinacea spp. Terminal-conjugated diynes were prepared by a Cadiot–Chodkiewitz coupling/deprotection sequence utilizing a protected bromoacetylene, and methyl-substituted diynes were made via a base-catalyzed rearrangement of
Abstract Accessible methods for the syntheses of some representatives of tetradecapentaenoic acid derivatives using organophosphorus reagents and highly stereoselective properties of phosphonate carbanions were developed. Graphical Abstract
(hydroxyl-α-sanshool, hydroxyl-β-sanshool, and γ-sanshool) as the key intermediates for the selective synthesis of these structurally unstable compounds. Consequently, we developed a concise and selective method for the total synthesis of sanshools in 5–6 steps (26–45% overall yield), including complexation of dienes with iron tricarbonyl group.
Provided are a method for producing a sanshool, which can produce a sanshool in a short process and with high stereoselectivity, as well as a novel diene iron complex compound that is a stable intermediate useful for the production method. The diene iron complex compound is represented by the following general formula (I):
(in which A represents CO, P(R
A
)
3
, CN, NO, SO(R
A
)
3
, or N(R
A
)
2
; R
A
represents a straight chain or branched chain alkyl group having 1 to 4 carbon atoms or an aryl group having 6 to 12 carbon atoms; and one of R
1
and R
2
represents a hydrogen atom and the other one thereof represents a structure represented by the following formula (II)):
(in which R represents a hydrogen atom, a hydroxyl group, or a methyl group).
Provided are a method for producing a sanshool, which can produce a sanshool in a short process and with high stereoselectivity, as well as a novel diene iron complex compound that is a stable intermediate useful for the production method. The diene iron complex compound is represented by the following general formula (I):
(in which A represents CO, P(RA)3, CN, NO, SO(RA)3, or N(RA)2; RA represents a straight chain or branched chain alkyl group having 1 to 4 carbon atoms or an aryl group having 6 to 12 carbon atoms; and one of R1 and R2 represents a hydrogen atom and the other one thereof represents a structure represented by the following formula (II)):
(in which R represents a hydrogen atom, a hydroxyl group, or a methyl group
本发明提供了一种生产山舒尔的方法,该方法可以在短时间内生产出山舒尔,并且具有很高的立体选择性;还提供了一种新型二烯铁络合物,该化合物是一种稳定的中间体,可用于该生产方法。二烯铁络合物由以下通式(I)表示:
(其中 A 代表 CO、P(RA)3、CN、NO、SO(RA)3 或 N(RA)2;RA 代表具有 1 至 4 个碳原子的直链或支链烷基或具有 6 至 12 个碳原子的芳基;R1 和 R2 中的一个代表氢原子,另一个代表下式 (II) 所表示的结构):
(其中 R 代表氢原子、羟基或甲基