反式-4-(N-乙酰氨基)环己醇是合成药物中间体反式-4-氨基环己醇盐酸盐的重要先行体。报道两步法合成反式-4-(N-乙酰氨基)环己醇研究结果,首先将起始原料对氨基苯酚用乙酸酐酰化,转化为对-(N-乙酰氨基)苯酚,接下来以5%Ru/C为催化剂,在有...反式-4-(N-乙酰氨基)环己醇是合成药物中间体反式-4-氨基环己醇盐酸盐的重要先行体。报道两步法合成反式-4-(N-乙酰氨基)环己醇研究结果,首先将起始原料对氨基苯酚用乙酸酐酰化,转化为对-(N-乙酰氨基)苯酚,接下来以5%Ru/C为催化剂,在有碱性助剂存在,5.0MPa,120℃条件下,将其氢化为顺式和反式混合的4-(N-乙酰氨基)环己醇,转化率为100%,4-乙酰氨基环己醇的选择性达到96.9%,根据高效液相色谱法检测得知,其反式与顺式比值为78∶22。最后通过重结晶分离出反式目标产物,总产率为67.0%。系统考察了多种因素对4-(N-乙酰氨基)苯酚的合成及后续催化氢化的影响。每步合成过程均由高效液相色谱监控。所有产物通过IR、1 H NMR、13C NMR光谱进行了结构表征。展开更多
Two new Gd Ⅲ complexes with nitrilotriacetic acid(nta) and trans-1,2-cyclohexanediaminetetraacetic acid(Cydta) ligands were synthesized. Their crystal structures were determined by single-crystal X-ray structure anal...Two new Gd Ⅲ complexes with nitrilotriacetic acid(nta) and trans-1,2-cyclohexanediaminetetraacetic acid(Cydta) ligands were synthesized. Their crystal structures were determined by single-crystal X-ray structure analyses. The crystal data are as follows: K 3[Gd Ⅲ(nta) 2·(H 2O)]·6H 2O, monoclinic system, C2/c space group, a=1.534 81(15) nm, b=1.292 05(12) nm, c=2.610 8(3) nm, β=96.244(2)°, V=5.146 7(9) nm 3, Z=8, M=776.87, D c=2.005 g/cm 3, μ= 3.149 mm -1 and \{F(000)=\}3 080, R=0.024 5, wR=0.064 3 for 4 455 unique reflections and R= 0.028 9, wR=0.067 2 for all 10 305 reflections. The Gd ⅢN 2O 7 part in the [Gd Ⅲ(nta) 2(H 2O)] 3- anion is a pseudo-monocapped square antiprismatic nine-coordination structure.(NH 4)[Gd Ⅲ(Cydta)(H 2O) 2]·5H 2O, triclinic system, P1 space group, a=0.866 2(3) nm, b=1.006 7(3) nm, c= 1.444 8(5) nm, α= 88.282(5)°, β=75\^190(5)°, γ=88.317(4)°, V=1.217 2(7) nm 3, Z=2, M=643.69, D c=1.756 g/cm 3, μ=2.798 mm -1 and F(000)=650, R=0.030 3, wR=0.080 9 for 4 273 unique reflections and R=0.033 2, wR=0.082 5 for all 5 062 reflections. The Gd ⅢN 2O 6 part in the [Gd Ⅲ(Cydta)(H 2O) 2] - anion has a pseudo-square antiprismatic eight-coordination structure.展开更多
文摘反式-4-(N-乙酰氨基)环己醇是合成药物中间体反式-4-氨基环己醇盐酸盐的重要先行体。报道两步法合成反式-4-(N-乙酰氨基)环己醇研究结果,首先将起始原料对氨基苯酚用乙酸酐酰化,转化为对-(N-乙酰氨基)苯酚,接下来以5%Ru/C为催化剂,在有碱性助剂存在,5.0MPa,120℃条件下,将其氢化为顺式和反式混合的4-(N-乙酰氨基)环己醇,转化率为100%,4-乙酰氨基环己醇的选择性达到96.9%,根据高效液相色谱法检测得知,其反式与顺式比值为78∶22。最后通过重结晶分离出反式目标产物,总产率为67.0%。系统考察了多种因素对4-(N-乙酰氨基)苯酚的合成及后续催化氢化的影响。每步合成过程均由高效液相色谱监控。所有产物通过IR、1 H NMR、13C NMR光谱进行了结构表征。
文摘Two new Gd Ⅲ complexes with nitrilotriacetic acid(nta) and trans-1,2-cyclohexanediaminetetraacetic acid(Cydta) ligands were synthesized. Their crystal structures were determined by single-crystal X-ray structure analyses. The crystal data are as follows: K 3[Gd Ⅲ(nta) 2·(H 2O)]·6H 2O, monoclinic system, C2/c space group, a=1.534 81(15) nm, b=1.292 05(12) nm, c=2.610 8(3) nm, β=96.244(2)°, V=5.146 7(9) nm 3, Z=8, M=776.87, D c=2.005 g/cm 3, μ= 3.149 mm -1 and \{F(000)=\}3 080, R=0.024 5, wR=0.064 3 for 4 455 unique reflections and R= 0.028 9, wR=0.067 2 for all 10 305 reflections. The Gd ⅢN 2O 7 part in the [Gd Ⅲ(nta) 2(H 2O)] 3- anion is a pseudo-monocapped square antiprismatic nine-coordination structure.(NH 4)[Gd Ⅲ(Cydta)(H 2O) 2]·5H 2O, triclinic system, P1 space group, a=0.866 2(3) nm, b=1.006 7(3) nm, c= 1.444 8(5) nm, α= 88.282(5)°, β=75\^190(5)°, γ=88.317(4)°, V=1.217 2(7) nm 3, Z=2, M=643.69, D c=1.756 g/cm 3, μ=2.798 mm -1 and F(000)=650, R=0.030 3, wR=0.080 9 for 4 273 unique reflections and R=0.033 2, wR=0.082 5 for all 5 062 reflections. The Gd ⅢN 2O 6 part in the [Gd Ⅲ(Cydta)(H 2O) 2] - anion has a pseudo-square antiprismatic eight-coordination structure.
