A synthesis of esters, amides, and sulfones bearing a 1-cyclopentenyl group at the α-position from cyclobutanones with one-carbon ring-expansion
作者:Tsuyoshi Satoh、Yu Awata、Shingo Ogata、Shimpei Sugiyama、Masami Tanaka、Motoo Tori
DOI:10.1016/j.tetlet.2009.02.053
日期:2009.4
derived from cyclobutanones and chloromethyl p-tolyl sulfoxide, with lithium enolate of carboxylic acid tert-butyl esters, lithium enolate of carboxylic acid N,N-dimethylamides, or lithium α-carbanion of alkyl phenyl sulfones gave adducts in high yields. The adducts were treated with isopropylmagnesium chloride or ethylmagnesium chloride in dry toluene to give esters, amides, and sulfones bearing a 1-cyclopentenyl
1-氯乙烯基治疗p -甲苯基砜,从cyclobutanones和氯衍生p -甲苯基砜,与锂羧酸的烯醇叔丁基酯,锂的羧酸烯醇化物N,N--二甲基酰胺,或烷基苯基砜的α-碳负离子锂可高收率加成。用异丙基氯化镁或乙基氯化镁在无水甲苯中处理加合物,以中等至良好的产率得到在α位带有1-环戊烯基的酯,酰胺和砜,并通过类胡萝卜素1,2进行一碳环扩环-CC插入反应。类胡萝卜素1,2-CC插入反应被证明具有高度立体定向性。描述了反应机理和特异性的起源。