N–N Bond-Forming Cyclization for the One-Pot Synthesis of <i>N</i>-Aryl[3,4-<i>d</i>]pyrazolopyrimidines
作者:Lindsay E. Evans、Matthew D. Cheeseman、Keith Jones
DOI:10.1021/ol301561a
日期:2012.7.6
An efficient one-pot synthesis of N-aryl[3,4-d]pyrazolopyrimidines in good yield and under mild reaction conditions is described. By exploiting electron-deficient hydroxylamines, the substituted oxime products were formed with very high E-diastereoselectivity. The key step utilizes a cyclization reaction upon an oxime derived from hydroxylamine-O-sulfonic acid to form the N–N bond of the product.
描述了N-芳基[3,4- d ] 吡唑并嘧啶的高效一锅法合成,收率良好,反应条件温和。通过利用缺电子羟胺,形成了具有非常高的E-非对映选择性的取代肟产物。关键步骤是利用羟胺-O-磺酸衍生的肟进行环化反应,形成产物的 N-N 键。