New Efficient Synthesis of 6,7,8,9-Tetrahydro-benzothieno[2,3-<i>d</i>]-1,2,4-triazolo[1,5-<i>a</i>]pyrimidin-10(3<i>H</i>)-ones via a Tandem Aza-Wittig/Heterocumulene-Mediated Annulation
作者:Ming-Wu Ding、Hong-Wu He、Nian-Yu Huang
DOI:10.1055/s-2005-865289
日期:——
The carbodiimides 2, obtained from aza-Wittig reactions of iminophosphorane 1 with aromatic isocyanates, reacted with hydrazine to give selectively 3-amino-2-arylamino-5,6,7,8-tetrahydro-benzothieno[2,3-d]pyrimidin-4(3H)-ones 4. Reactions of 4 with triphenylphosphine, hexachloroethane and Et 3 N produced iminophosphoranes 5. A tandem aza-Wittig reaction of iminophosphorane 5 with isocyanate, acyl chloride
由亚氨基正膦 1 与芳族异氰酸酯的氮杂维蒂希反应获得的碳二亚胺 2 与肼反应选择性地生成 3-氨基-2-芳基氨基-5,6,7,8-四氢-苯并噻吩并[2,3-d]嘧啶-4(3H)-ones 4. 4 与三苯膦、六氯乙烷和 Et 3 N 反应生成亚氨基正膦 5. 亚氨基正膦 5 与异氰酸酯、酰氯或 CS 2 的串联氮杂维蒂希反应生成 6,7,8,9-四氢-苯并噻吩并[2,3-d]-1,2,4-三唑并[1,5-a]嘧啶-10(3H)-酮7、9或11的收率令人满意。