Sequential Knoevenagel Reaction/Mislow-Evans Rearrangement Catalyzed by Heterogeneous Amine Grafted on Silica in Water, Leading to γ-Hydroxy-α,β-unsaturated Nitrile
作者:Hisahiro Hagiwara、Kohei Isobe、Ayuko Numamae、Takashi Hoshi、Toshio Suzuki
DOI:10.1055/s-2006-941590
日期:2006.6
γ-Hydroxy-α,β-unsaturated nitrile was obtained by the reaction of α-arylsulfinylacetonitrile with aldehyde in water, which was catalyzed by N,N-diethylaminopropylated silica gel. The overall transformation proceeded via five sequential reactions, 1,2-addition of acetonitrile, dehydration (Knoevenagel condensation), isomerization of the double bond, rearrangement of sulfinyl group (Mislow-Evans rearrangement) and hydrolysis of sulfinyl ester. The reaction condition was mild such that the AcO, TBMDSO or OTHP group remained intact in the products.
通过在水中用N,N-二乙基氨基丙基化硅胶催化的反应,将α-芳基亚磺酰乙腈与醛反应得到γ-羟基-α,β-不饱和腈。整个转化过程经过五个连续反应,包括乙腈的1,2-加成、脱水(克诺文-阿盖尔缩合)、双键异构化、亚磺酰基重排(米斯洛-埃文斯重排)和亚磺酰酯的水解。反应条件温和,使得AcO、TBMDSO或OTHP基团在产物中保持完整。