Preparation and reactivity of bridge-substituted bicyclo[3.2.1]octyl and bicyclo[3.3.1]nonyl toluenesulfonates
作者:C.S. Foote、R.B. Woodward
DOI:10.1016/s0040-4020(01)98630-2
日期:1964.1
Endo- and exo-bicyclo[3.2.1]octyl-8-tosylate (III and IV) and bicyclo[3.3.1]nonyl-9-tosylate (V) have been prepared by a novel synthetic sequence. In acetolysis, the relative rates are: III, 7·8 × 10−5; IV, 6·1 × 10−1; V, 3·0; for comparison, the rate of norbornyl-7-tosylate (I) is 9·1 × 10−8, and that of cyclohexyl tosylate (II) is 1·00. The solvolyses of IV and V are anchimerically accelerated. V
内-和外-双环[3.2.1]辛基-8-甲苯磺酸酯(III和IV)和双环[3.3.1]壬基-9-甲苯磺酸酯(V)已经通过新颖的合成序列制备。在乙解中,相对速率为:III,7·8×10 -5;IV,6·1×10 -1;V,3·0;为了比较,降冰片基-7-甲苯磺酸酯(I)的比率是9·1×10 -8,而甲苯磺酸环己基酯(II)的比率是1·00。IV和V的溶剂分解被手性加速。显示V在溶剂分解过程中经历离子对返回至顺-反-羟基-4-甲苯磺酸酯(XXIII)。III和I的相对较低的乙酰分解速率是在带有离去基团的碳原子处的内角应变的结果。