Asymmetric protected enoates as key intermediates towards an EPC synthesis of (+)-heptelidic acid
作者:Gerhard Riehs、Ernst Urban
DOI:10.1016/0040-4039(95)01538-s
日期:1995.10
the adducts 9n (5′R,6′R) and 10n (5′S,6′R) as single diastereomers, respectively. Finally, the (5′R) configurated enoate 6n turned out to be valuable as a chiral building block for an EPCsynthesis of (+)-heptelidicacid.
将(H 2 C = CH)2 CuLi共轭添加到6n和7n中,分别得到加合物9n(5'R,6'R)和10n(5'S,6'R)为单一非对映体。最终,(5'R)构型的烯酸酯6n作为(E)庚二酸的EPC合成的手性构件很有价值。
Preparation of Functionalized Alkylmagnesium Derivatives Using an I/Mg-Exchange
作者:Christian B. Rauhut、Viet Anh Vu、Fraser F. Fleming、Paul Knochel
DOI:10.1021/ol8000987
日期:2008.3.1
Functionalized alkylmagnesium reagents bearing an acetal, a ketal, an ester, or a pyridine ring were prepared by an I/Mg-exchange using iPr2Mg.LiCl or ClMg(CH2)5MgCl.2LiCl starting from functionalized primary alkyl iodides.
Asymmetric protected 2-oxo-5-isopropyl-cyciohexenecarboxylates as key intermediates towards an EPC synthesis of (+)-heptelidic acid
作者:Gerhard Riehs、Ernst Urban
DOI:10.1016/0040-4020(95)00952-3
日期:1996.1
Asymmetric shielded 2-oxo-5-isopropyl-cyclohexenecarboxylates 3n and 4n which are diastereomers at C-5′ have been prepared by a five step synthesis and separated by chromatography. Conjugate addition of (H2CCH)2CuLi to 3n and 4n gave the adducts 13n (5′R,6Ŕ) and 14n (5′S,6′R) as single diastereomers. respectively. Finally. the (5′R) configurated enoate 3n turned out to be valuable as chiral building
通过五步合成并通过色谱分离,制备了在C-5'处为非对映异构体的不对称保护的2-氧代-5-异丙基-环己烯羧酸酯3n和4n。将(H 2 C = CH)2 CuLi共轭加成到3n和4n中,得到加合物13n(5′R,6′)和14n(5′S,6′R)为单一非对映体。分别。最后。结果表明,(5'R)构型的烯酸酯3n作为EPC合成(+)-庚二酸的手性构件很有价值。