Stereoselective total synthesis of (+)-pinellic acid from l-(+)-tartaric acid
作者:Kavirayani R. Prasad、Bandita Swain
DOI:10.1016/j.tetasy.2008.04.015
日期:2008.5
The stereoselective total synthesis of (+)-pinellic acid, a natural product used in the treatment of influenza, was accomplished from l-(+)-tartaricacid. A key feature of the synthesis includes the elaboration of a γ-hydroxybutyramide derived from l-(+)-tartaricacid.
First stereoselective total synthesis and anticancer activity of new amide alkaloids of roots of pepper
作者:Ch. Srinivas、Ch.N.S. Sai Pavan Kumar、B. China Raju、V. Jayathirtha Rao、V.G.M. Naidu、S. Ramakrishna、Prakash V. Diwan
DOI:10.1016/j.bmcl.2009.08.056
日期:2009.10
The first stereoselectivetotalsynthesis of new natural amide alkaloids 1–3 have been achieved from commercially available starting materials. Wittig olefination, Sharpless asymmetric dihydroxylation, epoxidation, a trans regioselective opening of 2,3-epoxy alcohol, Horner–Wadsworth–Emmons (HWE) olefination and amide coupling are the key steps. The amide alkaloids 1–3 are evaluated for their anticancer
The first synthesis of threo and erythro (E)-4,5-dihydroxydec-2-enals, aldehydes related to the lipid peroxidation is accomplished by reaction of α-benzoyloxheptanal with the Grignard reagent of 3,3-diethoxy-1-propyne and lithiumaluminumhydride reduction. Acetonization of the diol system allows a simple chromatographic separation of the diastereoisomers, the geometry of which was established by 1H
苏-和赤(E)-4,5-二羟基癸-2-烯醛(与脂质过氧化有关的醛)的首次合成是通过α-苯甲酰氧基庚醛与3,3-二乙氧基-1-丙炔的格利雅试剂和氢化铝锂还原。二醇体系的丙酮化可以简单地色谱分离非对映异构体,其几何结构通过1 H和13 C NMR实验确定,并通过(E,4R,5R)-4,5-O-的独立合成得到证实D-甘露糖醇的异亚丙基-4,5-二羟基癸-2-烯醛。
The first synthesis of all possible stereoisomers of the (E)-4,5-dihydroxydec-2-enal, in homochiral form
The first synthesis of the four possible isomers of (E)-4,5-dihydroxydec-2-enal, a cytotoxic product of microsomal lipid peroxidation, is accomplished starting with D- and L-arabinose, D-ribose and D-lyxose by an identical reaction sequence. Each pentose was diacetonised and subjected to a Wittig reaction for the introduction of a four carbon chain. A selective cleavage of the terminal isopropylidene acetal and the oxidation of the diolic system affords a noraldehyde which is treated with (formylmethylene)triphenylphosphorane to afford the target molecule after regeneration of the diolic system.