作者:Sariya Yodwaree、Darunee Soorukram、Chutima Kuhakarn、Patoomratana Tuchinda、Vichai Reutrakul、Manat Pohmakotr
DOI:10.1039/c4ob01078g
日期:——
stereoselective construction of (3R,4S,5R)- and (3R,4S,5S)-trisubstituted γ-butyrolactones 3 and 4 from (2R,3R)-2,3-dimethyl-4-pentenoic acid derivative 7, which was readily obtained via stereoselective conjugate addition of vinylmagnesium chloride to a chiral α,β-unsaturated N-acyl oxazolidinone (Evans’ auxiliary) followed by α-methylation.
的正式合成(+) - 3-外延-eupomatilone-6(1)和3,5-双-差向异构体(2)已经完成。关键的合成策略涉及从(2 R,3 R)-2,(3 R,4 S,5 R)-和(3 R,4 S,5 S)-三取代γ-丁内酯3和4的立体选择性结构, 3-二甲基-4-戊烯酸衍生物7,可以通过将乙烯基氯化镁立体选择性共轭加成到手性α,β-不饱和N中获得-酰基恶唑烷酮(Evans助剂),然后进行α-甲基化。