Intramolecular cyclization of β,β-difluorostyrenes bearing an iminomethyl or a diazenyl group at the ortho position: synthesis of 3-fluorinated isoquinoline and cinnoline derivatives
作者:Junji Ichikawa、Yukinori Wada、Hiroyuki Kuroki、Jun Mihara、Ryo Nadano
DOI:10.1039/b712965c
日期:——
the corresponding oximes or imines and (ii) subsequent intramolecular replacement of a vinylic fluorine by the sp(2) nitrogen of the iminomethyl group (HON=CH- or HN=CH-). Beta,beta-Difluorostyrenes bearing an o-diazenyl group (HN=N-), generated by reduction of the corresponding diazonium ions, undergo a similar substitution to afford 3-fluorinated cinnolines.
邻甲酰基取代的β,β-二氟苯乙烯易于与NH(2)OH.HCl或NH(4)OAc反应,从而通过(i)形成相应的肟或亚胺和(ii)形成高收率的3-氟异喹啉衍生物。 )随后通过亚氨基甲基的sp(2)氮(HON = CH-或HN = CH-)分子内取代乙烯基氟。通过还原相应的重氮离子而生成的带有邻二氮烯基(HN = N-)的β,β-二氟苯乙烯进行类似的取代反应,得到3-氟化的cinnolines。