SYNTHESIS OF 1,2-DIAZEPINES-H-3 BY THE BASE-INDUCED ELIMINATION OF TOLUENE-PARA-SULFINIC ACID FROM "3,4-DIHYDRO-2-TOSYL-1,2-DIAZEPINES, AND SOME OBSERVATIONS ON SIGMATROPIC HYDROGEN SHIFTS IN THE 1,2-DIAZEPINE-H-3 SYSTEM

被引:23
作者
ANDERSON, CD [1 ]
SHARP, JT [1 ]
STRATHDEE, RS [1 ]
机构
[1] UNIV EDINBURGH,DEPT CHEM,EDINBURGH EH9 3JJ,MIDLOTHIAN,SCOTLAND
来源
JOURNAL OF THE CHEMICAL SOCIETY-PERKIN TRANSACTIONS 1 | 1979年 / 09期
关键词
D O I
10.1039/p19790002209
中图分类号
O62 [有机化学];
学科分类号
070303 ; 081704 ;
摘要
The reaction of 3,4-dihydro-2-tosyl-1,2-diazepines (13) with sodium ethoxide provides the first general synthesis of 3H-1,2-diazepines (9). The 1H and 13C n.m.r. spectra of the products show that they exist as diazepines (3) rather than as the diazanorcaradiene valence tautomers (4). In some cases the synthesis produced mixtures of isomeric 3H-1,2-diazepines via a rapid [1,5] sigmatropic hydrogen shift in the primary product. A preliminary kinetic study of the isomerisation of 3,5-dimethyl-3H-1,2-diazepine (14c) to 5,7-dimethyl-3H-1,2-diazepine (9c) at 0°C has shown that the hydrogen shift is ca. 1010 faster than in an analogous cycloheptatriene.
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页码:2209 / 2214
页数:6
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