作者:Hai-Xia. Lin、Na Han、Jian-Min Chen、Tian-Hai Yuan
DOI:10.1007/s10870-006-9069-5
日期:2006.5
7,9-dideacetyl-1-deoxybaccatinVI was synthesized from 1-deoxybaccatinVI and its crystal structure was determined by X-ray crystallographic techniques. The compound (C33H42O11·2CH4O) crystallizes into monoclinic space group P21 with unit cell parameters: a=8.654(17) Å, b=16.470(5) Å, c=12.671(3) Å, β=97.63(2)°, and Z=2. The X-ray results demonstrated that the reaction of 7,9,10-Trideacetyl-1-deoxy-baccatinVI with Ac2O in tetrahydrofuran, using CeCl3 as catalyst, yielded monoacetylated product 7,9-dideacetyl-1-deoxy baccatinVI. In the structure, the six-membered A ring exhibits boat conformation, the eight-membered B ring adopts boat-chair conformation, and the six-membered C ring exhibits sofa conformation.
以 1-脱氧巴卡丁六为原料合成了 7,9-二乙酰基-1-脱氧巴卡丁六,并通过 X 射线晶体学技术确定了其晶体结构。该化合物(C33H42O11-2CH4O)结晶为单斜空间群 P21,单胞参数为:a=8.654(17) 埃,b=16.470(5) 埃,c=12.671(3) 埃,β=97.63(2)°,Z=2。X 射线结果表明,以 CeCl3 为催化剂,7,9,10-三乙酰基-1-脱氧巴卡丁 VI 与 Ac2O 在四氢呋喃中反应,生成单乙酰化产物 7,9-二乙酰基-1-脱氧巴卡丁 VI。在该结构中,六元 A 环呈舟形构象,八元 B 环呈舟椅形构象,六元 C 环呈沙发形构象。