β-二氢沉香呋喃倍半萜的~1H和^(13)C化学位移全指定及^(13)C化学位移与立体化学之间的关系(英文)

COMPLETE ~1H AND ^(13)C CHEMICAL SHIFTS ASSIGNMENTS AND THE RELATIONSHIP BETWEEN ^(13)C CHEMICAL SHIFTS AND STEREOCHEMISTRY FOR β-DIHYDROAGAROFURAN SESQUITERPENE

采用~1H,^(13)C-COSY和COLOC谱,对三个(1-3)β-二氢沉香些喃倍半萜的~1H和^(13)C化学位移进行了全指定.经过考察和比较上述化合物及十九个文献报导化合物的立体化学和C—14化学位移的关系,得出一个新的,非常重要的构型判断方法.

Complete 1H and 13C chemical shifts assignments of three kinds of b- dihydroagarofuran sesquiterpcnoids (1-3) were carried out on the basis of 1H, 13C-COSY and 1H, 13C long-range COSY( COLOC) spectra. An exact examination and comparison of the relationship between the 13C chemical shifts for C-14 and the stereochemistry at C-8 and C-9 for these compounds , as well as nineteen other various β-dihydroagarofuran compounds, have led to a new and very important means of conformational characterization.