Mild and high-yielding syntheses of diethyl phosphoramidate-stoppered [2]rotaxanes.
The mild and efficient reaction between triethyl phosphite and benzylic azides allows us not only to construct rotaxanes in high yield from dibenzo[24]crown-8 (DB24C8) and dibenzylammonium (DBA(+))-derived threads but also to incorporate di(p-toluidine)[24]crown-8, which binds DBA(+) ions much more weakly than does DB24C8, into a corresponding [2]rotaxane.
Hung
Wei-Chung
WC
Department of Chemistry, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei, Taiwan 10617, R.O.C.
Liao
Kang-Shyang
KS
Liu
Yi-Hung
YH
Peng
Shie-Ming
SM
Chiu
Sheng-Hsien
SH