Author/Authors :
Takafumi Arao، نويسنده , , Kazuhiro Kondo، نويسنده , , Toyohiko Aoyama، نويسنده ,
Abstract :
The publisher regrets that this was an accidental duplication of an article that has already been published in Tetrahedron Lett. 48 (2007) 4115–4117, . The duplicate article has therefore been withdrawn.
