Ring Transformation of Fused Pyridazines. II. New N-N Bond Cleavage of Fused Chloropyridazines with Ynamines.
作者:Etuo OISHI、Ken-ichi IWAMOTO、Tomomi OKADA、Sumiko SUZUKI、Ken-ichi TANJI、Akira MIYASHITA、Takeo HIGASHINO
DOI:10.1248/cpb.42.2219
日期:——
1-Chlorophthalazine (1) reacts with a 2-fold molar excess of ynamines 2a, b to give penta-substituted pyridine derivatives 3a, b by nitrogen-nitrogen bond cleavage of the pyridazine ring with release of hydrogen chloride. Similarly, other fused pyridazines having a chloro substituent α to nitrogen in the pyridazine ring, i.e., pyrido[3, 4-d]- (10a), pyrido[2, 3-d]- (10b), thiazolo[4, 5-d]- (10c, d), furo[2, 3-d]- (10e) and pyrrolo[2, 3-d]- (10f, g) pyridazine derivatives, gave the corresponding penta-substituted pyridines 11a-11k.
1-Chlorophthalazine (1) 与摩尔过量 2 倍的 ynamines 2a, b 反应,通过哒嗪环的氮-氮键裂解并释放出氯化氢,得到五取代吡啶衍生物 3a, b。同样,其他在哒嗪环的氮上具有氯取代基 α 的融合哒嗪,即吡啶并[3,4-d]- (10a)、吡啶并[2,3-d]- (10b)、噻唑并[4,5-d]- (10c,d)、呋喃并[2,3-d]- (10e) 和吡咯并[2,3-d]- (10f,g) 哒嗪衍生物,得到了相应的五取代吡啶 11a-11k。