d5-Reactions of Doubly Deprotonated ?,?-Unsaturated Carbonyl Derivatives with Electrophiles. A Novel Approach to the Synthesis of Tetrahydrofuran and Tetrahydropyran Derivatives
作者:Dieter Seebach、Manat Pohmakotr、Christian Schregenberger、Beat Weidmann、Raghao S. Mali、Srisuke Pohmakotr
DOI:10.1002/hlca.19820650202
日期:1982.3.17
tested (alkyl halide, silyl chloride, ester, ketone, aldehyde, epoxide) to give β, γ-unsaturated carbonyl compounds of type A (see Formulae2–6, 13, 14 and Tables 1–5). The α- and β-hydroxyalkylation products obtained from 1a–1d can be converted to tetra-hydrofuran and tetrahydropyran derivatives 7 and 16, respectively (Tables 1 and 2), those from the sulfur analogues 1e and 1f to ketene thioacetals
的二烯酮-二价阴离子衍生物1与所有类型的测试电体(烷基卤化物,甲硅烷基氯化物,酯,酮,醛,环氧化物)反应,得到β,类型的γ不饱和羰基化合物甲(见公式2 - 6,13,14和表1-5)。由1a - 1d获得的α-和β-羟烷基化产物可以分别转化成四氢呋喃和四氢吡喃衍生物7和16(表1和2),它们是由硫类似物1e和1f得到的。到烯酮缩醛9和二烯酮衍生物10和12的吨丁基和α羟基酮被切割,得到腈,酰胺,羧酸和酯(式16 - 25)。试剂1允许合成产品与远方的官能团在一个步骤中(参见1,8-二酮14和公式26 - 30); 它们对应于d 5的合成子31 - 33 ; 在表6中,将它们与其他d 5试剂进行了比较。