使用Pd / C催化的邻卤代吡啶并异氰酸酯化制备三种类型的2-取代的呋喃并[3,2- b ]吡啶,呋喃[2,3– b ]吡啶和呋喃[3,2– c ]吡啶。无铜和无配体条件下的末端炔烃。我们还证明,通过异环化,随后进行溴化和Suzuki / Heck反应,可以实现产生2,3-二取代的呋喃吡啶的双重功能化。另外,在不存在助催化剂和配体的情况下使用可回收的Pd / C可有助于开发更绿色的化学工艺。
Novel heteroaromatic CH insertion of alkylidenecarbenes. A new entry to furopyridine synthesis
作者:Tsugio Kitamura、Kuniyuki Tsuda、Yuzo Fujiwara
DOI:10.1016/s0040-4039(98)01034-x
日期:1998.7
of potassium tert-butoxide undergoes a novel heteroaromatic CHinsertion of alkylidenecarbenes generated in situ to give the corresponding furopyridine derivatives. The heteroaromatic CHinsertion shows an extremely high selectivity compared with the possible aliphatic CHinsertion. This process is also applied to furoquinoline synthesis.