(-)-(4S,5S)-1-tert-butoxycarbonyl-4-(2-furyl)-4,5-dihydro-3-hydroxymethyl-5-trimethylsilyl-1H-pyrazole | 224571-83-9

• 分子结构分类: 有机化合物 - 有机杂环化合物 - 唑啉类
• 英文名称: (-)-(4S,5S)-1-tert-butoxycarbonyl-4-(2-furyl)-4,5-dihydro-3-hydroxymethyl-5-trimethylsilyl-1H-pyrazole
• CAS: 224571-83-9
• 化学式: C₁₆H₂₆N₂O₄Si
• 分子量: 338.479
• InChiKey: RCUPVQDPRWQHOD-KBPBESRZSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  3.21
• 重原子数：
  23.0
• 可旋转键数：
  3.0
• 环数：
  2.0
• sp3杂化的碳原子比例：
  0.62
• 拓扑面积：
  75.27
• 氢给体数：
  1.0
• 氢受体数：
  5.0

反应信息

• 作为反应物：
  描述：

  (-)-(4S,5S)-1-tert-butoxycarbonyl-4-(2-furyl)-4,5-dihydro-3-hydroxymethyl-5-trimethylsilyl-1H-pyrazole 在 咪唑 、 三乙基硼氢化锂 、 potassium carbonate 作用下， 以 二氯甲烷 、 水 、 乙腈 为溶剂， 反应 17.0h， 生成 (-)-(3S,4S,5S)-1-<(tert-butoxycarbonyl)amino>-3-(tert-butyldimethylsilyloxymethyl)-2-(ethoxycarbonyl)-4-(2-furyl)-5-trimethylsilylpyrazolidine
  参考文献：
  名称：

  First Highly Regio- and Diastereoselective [3+2] Cycloaddition of Chiral Nonracemic Alkenyl Fischer Carbene Complexes with Diazomethane Derivatives: Preparation and Synthetic Applications of Enantiomerically Pure Δ2-Pyrazolines

  摘要：

  The [3+2] cycloaddition of alkenyl Fischer carbene complexes 1 and 6 with diazomethane derivatives to give Delta(2)-pyrazoline carbenes 2, 4, and 7 is described. The conversion of (-)-8-phenylmenthol-derived carbenes 6 into pyrazoline esters 9 through a one-pot cycloaddition-protection-oxidation is presented as an expeditious route to enantiomerically pure 3-alkoxycarbon-yl-Delta(2)-pyrazolines in good yields and in a highly regio- and diastereoselective manner. Pyrazolidines 13 were synthesized in excellent overall yields from 9 through pyrazolines 11 and 12, the diastereoselective reduction of C=N bond being the key step. Azaprolines 16 and 17 were prepared in very good yields from epimeric trans-13 or cis-13 by oxidative deprotection of the silylated hydroxy group. In an alternative reaction, the pyrazolidine ring of 13 was reduced to obtain protected open-chain 2,4-diamino alcohols 19 with three chiral centers.

  DOI：

  10.1002/(sici)1521-3765(19990301)5:3<883::aid-chem883>3.0.co;2-0
• 作为产物：
  描述：

  (+)-(1R,2S,5R)-8-phenylmenthyl 3-((4S,5S)-1-tert-butoxycarbonyl-4-(2-furyl)-4,5-dihydro-5-trimethylsilyl-1H-pyrazole)carboxylate 在 sodium tetrahydroborate 作用下， 以 四氢呋喃 、 甲醇 为溶剂， 反应 16.0h， 以76%的产率得到(-)-(4S,5S)-1-tert-butoxycarbonyl-4-(2-furyl)-4,5-dihydro-3-hydroxymethyl-5-trimethylsilyl-1H-pyrazole
  参考文献：
  名称：

  First Highly Regio- and Diastereoselective [3+2] Cycloaddition of Chiral Nonracemic Alkenyl Fischer Carbene Complexes with Diazomethane Derivatives: Preparation and Synthetic Applications of Enantiomerically Pure Δ2-Pyrazolines

  摘要：

  The [3+2] cycloaddition of alkenyl Fischer carbene complexes 1 and 6 with diazomethane derivatives to give Delta(2)-pyrazoline carbenes 2, 4, and 7 is described. The conversion of (-)-8-phenylmenthol-derived carbenes 6 into pyrazoline esters 9 through a one-pot cycloaddition-protection-oxidation is presented as an expeditious route to enantiomerically pure 3-alkoxycarbon-yl-Delta(2)-pyrazolines in good yields and in a highly regio- and diastereoselective manner. Pyrazolidines 13 were synthesized in excellent overall yields from 9 through pyrazolines 11 and 12, the diastereoselective reduction of C=N bond being the key step. Azaprolines 16 and 17 were prepared in very good yields from epimeric trans-13 or cis-13 by oxidative deprotection of the silylated hydroxy group. In an alternative reaction, the pyrazolidine ring of 13 was reduced to obtain protected open-chain 2,4-diamino alcohols 19 with three chiral centers.

  DOI：

  10.1002/(sici)1521-3765(19990301)5:3<883::aid-chem883>3.0.co;2-0