Reactions of cephalosporin sulphones 2. Rearrangement of 2α-bromocephem sulphones to pyrroles
作者:Tamás E Gunda、Gabriella N Szöke
DOI:10.1016/s0040-4020(98)00316-0
日期:1998.6
2α-Bromocephem sulphones exhibit two different rearrangements in acetonitrile solution: first, the tendency for elimination of the bromine as a bromonium ion leads to its formal movement to the para position of the 7β-aromatic ring. Secondly, a bromopyrrole derivative may also form, which can possibly be attributed to an unusual Ramberg-Bäcklung-like rearrangement followed by bromination.
2α-溴头孢砜在乙腈溶液中表现出两种不同的重排:首先,作为溴离子消除溴的趋势导致其正式移动到7β-芳族环的对位。其次,还可能形成溴吡咯衍生物,这可能归因于不寻常的Ramberg-Bäcklung样重排,然后进行溴化。