Addition of stannylated carboxylic acid derivatives to the carbonyl group of aldehydes
作者:A.N. Kashin、M.L. Tulchinsky、I.P. Beletskaya
DOI:10.1016/0022-328x(85)87335-6
日期:1985.9
Adducts obtained in high yield in these reactions readily undergo hydrolysis (when treated with aqueous KF) and acetolysis (when treated with AcCl) with quantative formation of 3-hydroxy and 3-acetoxy derivatives of esters, nitriles and amides. We show that interaction of Et3SnCH2COOEt with the above-mentioned aldehydes and isovaleraldehyde in the presence of equimolar amounts of Et4NCl in CH2Cl2/HMPTA ()
在Bu 3 SnI存在下,在75°C下,Bu 3 SnCH 2 COOEt与PhCHO的加成反应;在20°C下,Et 3 SnCH 2 X(X = COOEt,CN,CONMe 2)与苯甲醛,肉桂醛和糠醛的反应。研究了在Me 4 NF(2摩尔%)存在下的DMSO 。在这些反应中以高收率获得的加合物易于水解(当用KF水溶液处理时)和乙酰分解(当用AcCl处理时),从而定量形成酯,腈和酰胺的3-羟基和3-乙酰氧基衍生物。我们证明了Et 3 SnCH 2的相互作用在20℃下在CH 2 Cl 2 / HMPTA()中等摩尔量的Et 4 NCl存在下,用上述醛和异戊醛进行COOEt处理,然后用AcCl处理反应混合物,容易得到3-乙酰氧基酯。PhCH(SnMe 3)COOEt与丙烯醛,巴豆醛和肉桂醛的反应以及获得的加合物的水解仅产生1,2-加成产物,这些反应实际上是非立体选择性的。PhCH(SnMe