<i>N</i>-(Arylmethyl)-2-(or -4)-cyanopyridinium Hexafluoroantimonates as New Useful Catalysts for Acetalization of Carbonyl Compounds
作者:Sang-Bong Lee、Sang-Do Lee、Toshikazu Takata、Takeshi Endo
DOI:10.1055/s-1991-26467
日期:——
Carbonyl compounds 1 were converted to the corresponding 1,3-dioxolanes 2 and 1,3-dioxanes 4 with ethylene glycol and 2,2-dimethyl-1,3-propandiol, respectively, in the presence of 1-3 mol% of N-(benzyl, 4-methylbenzyl or 4-methoxybenzyl)-2(or -4)-cyanopyridinium hexafluoroantimonates 3. The catalyst 3d was also effective for the tetrahydropyranylation.
卡宾化合物1在乙烯二醇和2,2-二甲基-1,3-丙二醇存在下,分别转变为相应的1,3-二氧杂环戊烷2和1,3-二氧杂环己烷4,催化剂为N-(苄基、4-甲基苄基或4-甲氧基苄基)-2(或-4)-氰基吡啶六氟锑酸盐3,用量为1-3摩尔%。催化剂3d同样适用于四氢吡喃化反应。