名称:
Synthesis of 2,12-Dithia[3](2,6)pyridino[3](1,4)cycl[3.2.2]azinophane and It's Barrier to Methylene Twist
摘要:
A synthesis of the title compound (11) is completed starting from indolizine (3). Key intermediate, bis(mercaptomethyl)cycl[3.2.2]azine (9) has been synthesized by reduction of bis(acetylthiomethyl)cycl[3.2.2]azine (8) with LiAlH4. 2, 12-Dithia[3] (2,6)pyridino[3](1,4)cycl[3.2.2]azinophanes (11a,b) have been synthesized by the reaction of 9 with 2,6-bis(bromomethyl)pyridine (10) in the presence of Cs2CO3 by the high dilution method. In the H-1-nmr spectrum of 11a,b, these exist in the syn conformation in their H-1-nmr spectra With regard to 2, 12-dithia[3](2,6)pyridino[3](1,4)cycl[3.2.2]azinophane (11a), the coalescence temperature for the methylene twist yields an activation barrier, Delta G(double dagger), of 79.5 ki mol(-1) for variable temperature (VT) nmr method.