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-sulfonicacid 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。
CLARK J.; PARVIZI B.; COLMAN R., J. CHEM. SOC. PERKIN TRANS., PART 1 <JCPK-BH>, 1976, NO 9, 1004-1007
作者:CLARK J.、 PARVIZI B.、 COLMAN R.
DOI:——
日期:——
A Cascade Reaction with Iminium Ion Isomerization as the Key Step Leading to Tetrahydropyrimido[4,5-<i>d</i>]pyrimidines
作者:Lianyou Zheng、Fengzhi Yang、Qun Dang、Xu Bai
DOI:10.1021/ol703049j
日期:2008.3.1
A novel cascade reaction of aminopyrimidines 1 with N-alkyl amino acids or analogues was investigated. The keys to this cascade are the isomerization of an iminium ion formed between the aldehyde group in pyrimidine and the secondary amine of an amino acid, and subsequent cyclization to the neighboring amino group. This sequence could be useful in the synthesis of novel tetrahydropyrimido[4,5-d]pyrimidine