N,N,N',N'-tetramethylethanediamine * 2 BH(Br)COOMe | 214530-88-8

• 英文名称: N,N,N',N'-tetramethylethanediamine * 2 BH(Br)COOMe
• CAS: 214530-88-8
• 化学式: C₁₀H₂₄B₂Br₂N₂O₄
• 分子量: 417.742
• InChiKey: LQUOGSGQXVOIAF-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  None
• 重原子数：
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• 可旋转键数：
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• 环数：
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• sp3杂化的碳原子比例：
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• 拓扑面积：
  None
• 氢给体数：
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• 氢受体数：
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反应信息

• 作为反应物：
  描述：

  六氟磷酸钾 、 四甲基乙二胺 、 N,N,N',N'-tetramethylethanediamine * 2 BH(Br)COOMe 以 甲醇 为溶剂， 以44%的产率得到2-methoxycarbonyl-1,1,3,3-tetramethyl-1,3,2λ(4)-diazaborolidinium hexafluorophosphate
  参考文献：
  名称：

  Synthesis, Characterization, and Bromine Substitution of Diamine Complexes of Carboxyborane and Methoxycarbonylborane. Diazabora Rings Containing B-Carboxyl and B-Carboxylato Groups

  摘要：

  DA . 2BH(2)CN (1) [DA = N,N,N',N'-tetramethylethanediamine (TMEDA, a), N,N,N',N'-tetramethylpropanediamine (TMPDA, b), and N,N,N',N'-tetramethylbutanediamine (TMBDA, c)], (DA . 2BH(2)CNEt)(BF4)(2) (2), and DA . 2BH(2)-COOH (3) complexes were prepared from Me2S solution of (BH2CN)(n) (--> 1 --> 2 --> 3) in fast procedures, differently from those usually applied. in good yields. Dimethyl esters (4) were prepared from 3 with methanol in very fast reactions catalyzed by HBr. 3 and 4 were transformed into DA . BH2COOH (5a,b) and DA . BH2COOMe (6) with DA in THF. Bromination of 3 in aqueous HBr yielded diamine-bis(monobromocarboxyboranes) (7), in vigorous conditions diamine-bis(dibromocarboxyboranes) (9) were produced. N-Bromosuccinimide in methanol transformed 3a,b directly into diamine-bis(bromomethoxycarbonylboranes) (8a,b). BrH . DA . BH(Br)COOH (10a,b) could be prepared from 5a,b with bromine in strongly acidic medium. N-Deprotonated 10a quickly transformed into a five-membered cyclic cation [TMEDA . BHCOOH](+) (cation in 12a) in both water and methanol. Thus, this ion was formed by dissolution of 10a in water, bromination of 5a or destroying one of the borane moieties in 7a by a base. N-Deprotonated 10b in water decomposed with a pH-dependent rate, but in methanol, in the presence of base, it transformed into a six-membered cyclic cation [TMPDA . BHCOOH](+) (cation in 12b). 8a,b could also be transformed into cyclic cations by destroying one of their borane moieties in methanol, (8b in absence of acids only). All cations were prepared as bromide, hexafluorophosphate and tetraphenylborate salts, pK(a) values of 12a,b (pK(a) = 5.5-5.6) are 3 units lower than those of amine-carboxyboranes. Zwitterions (18a,b) formed by their deprotonation were prepared. Cyclic cation [TMEDA . B(Br)COOH](+) (cation in 19a) formed on destroying one dibromocarboxyborane of 9a. This cation, quite a strong acid (pK(a) approximate to 4.2), was prepared as hexafluorophosphate and tetraphenylborate salt. The latter was transformed with aqueous KOH into the corresponding zwitterion (21a).

  DOI：

  10.1021/ic9713442
• 作为产物：
  描述：

  甲醇 、 N-溴代丁二酰亚胺(NBS) 、 N,N,N',N'-tetramethylethanediamine * 2 BH2COOH 以 甲醇 为溶剂， 以74%的产率得到N,N,N',N'-tetramethylethanediamine * 2 BH(Br)COOMe
  参考文献：
  名称：

  Synthesis, Characterization, and Bromine Substitution of Diamine Complexes of Carboxyborane and Methoxycarbonylborane. Diazabora Rings Containing B-Carboxyl and B-Carboxylato Groups

  摘要：

  DA . 2BH(2)CN (1) [DA = N,N,N',N'-tetramethylethanediamine (TMEDA, a), N,N,N',N'-tetramethylpropanediamine (TMPDA, b), and N,N,N',N'-tetramethylbutanediamine (TMBDA, c)], (DA . 2BH(2)CNEt)(BF4)(2) (2), and DA . 2BH(2)-COOH (3) complexes were prepared from Me2S solution of (BH2CN)(n) (--> 1 --> 2 --> 3) in fast procedures, differently from those usually applied. in good yields. Dimethyl esters (4) were prepared from 3 with methanol in very fast reactions catalyzed by HBr. 3 and 4 were transformed into DA . BH2COOH (5a,b) and DA . BH2COOMe (6) with DA in THF. Bromination of 3 in aqueous HBr yielded diamine-bis(monobromocarboxyboranes) (7), in vigorous conditions diamine-bis(dibromocarboxyboranes) (9) were produced. N-Bromosuccinimide in methanol transformed 3a,b directly into diamine-bis(bromomethoxycarbonylboranes) (8a,b). BrH . DA . BH(Br)COOH (10a,b) could be prepared from 5a,b with bromine in strongly acidic medium. N-Deprotonated 10a quickly transformed into a five-membered cyclic cation [TMEDA . BHCOOH](+) (cation in 12a) in both water and methanol. Thus, this ion was formed by dissolution of 10a in water, bromination of 5a or destroying one of the borane moieties in 7a by a base. N-Deprotonated 10b in water decomposed with a pH-dependent rate, but in methanol, in the presence of base, it transformed into a six-membered cyclic cation [TMPDA . BHCOOH](+) (cation in 12b). 8a,b could also be transformed into cyclic cations by destroying one of their borane moieties in methanol, (8b in absence of acids only). All cations were prepared as bromide, hexafluorophosphate and tetraphenylborate salts, pK(a) values of 12a,b (pK(a) = 5.5-5.6) are 3 units lower than those of amine-carboxyboranes. Zwitterions (18a,b) formed by their deprotonation were prepared. Cyclic cation [TMEDA . B(Br)COOH](+) (cation in 19a) formed on destroying one dibromocarboxyborane of 9a. This cation, quite a strong acid (pK(a) approximate to 4.2), was prepared as hexafluorophosphate and tetraphenylborate salt. The latter was transformed with aqueous KOH into the corresponding zwitterion (21a).

  DOI：

  10.1021/ic9713442