(-)-(4S)-1-tert-butoxycarbonyl-4,5-dihydro-3-hydroxymethyl-4-phenyl-1H-pyrazole | 224571-74-8

• 分子结构分类: 有机化合物 - 苯类化合物 - 苯和取代衍生物
• 英文名称: (-)-(4S)-1-tert-butoxycarbonyl-4,5-dihydro-3-hydroxymethyl-4-phenyl-1H-pyrazole
• CAS: 224571-74-8
• 化学式: C₁₅H₂₀N₂O₃
• 分子量: 276.335
• InChiKey: LRIFQCBUWAMLRC-GFCCVEGCSA-N

反应信息

• 作为反应物：
  描述：

  (-)-(4S)-1-tert-butoxycarbonyl-4,5-dihydro-3-hydroxymethyl-4-phenyl-1H-pyrazole 在 咪唑 、 三乙基硼氢化锂 作用下， 以 二氯甲烷 为溶剂， 反应 17.0h， 生成 (-)-(3R,4S)-1-tert-butoxycarbonyl-3-tert-butyldimethylsilyloxymethyl-4-phenylpyrazolidine
  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)-1-tert-butoxycarbonyl-4,5-dihydro-4-phenyl-1H-pyrazole)carboxylate 在 sodium tetrahydroborate 作用下， 以 四氢呋喃 、 甲醇 为溶剂， 反应 16.0h， 以83%的产率得到(-)-(4S)-1-tert-butoxycarbonyl-4,5-dihydro-3-hydroxymethyl-4-phenyl-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