A synthesis of bicyclo[n.1.0]alkanes having tert-butyl carboxylate or acetamide moiety via the intramolecular 1,3-CH insertion of magnesium carbenoids
作者:Shingo Ogata、Hideki Saitoh、Daisuke Wakasugi、Tsuyoshi Satoh
DOI:10.1016/j.tet.2008.04.024
日期:2008.6
enolate of carboxylic acid tert-butyl esters or N,N-dimethylacetamide gave adducts in high yields. The adducts were treated with ether solution of isopropylmagnesium chloride in dry toluene to give bicyclo[n.1.0]alkane derivatives having tert-butyl carboxylate or acetamide moiety on the bridgehead carbon in high to quantitative yields via magnesium carbenoid 1,3-CH insertion reaction. The 1,3-CH insertion
1-氯乙烯基治疗p -甲苯基砜,来自各种环酮和氯甲基衍生的p -甲苯基砜,与锂羧酸的烯醇叔丁基酯或Ñ,ñ二甲基乙酰胺,得到高收率的加合物。该加合物在干燥的甲苯与异丙基氯化镁的乙醚溶液处理,得到双环[ Ñ .1.0]具有烷衍生物叔通过羧甲基1,3-CH插入反应,桥头碳上的羧酸丁酯或乙酰胺部分以高产率或定量产率产生。1,3-CH插入反应被证明具有区域选择性和立体特异性。讨论了反应机理以及选择性和特异性的起源。