用途
α,α-二甲基苯乙酸用于药物非索非那定的合成制备,作为重要的医药中间体。此外,它还是非索非那定的重要中间体。
中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
2-苯基丙酸 | hydratropic acid | 492-37-5 | C9H10O2 | 150.177 |
2,2-二甲基苯乙酸甲酯 | methyl 2-methyl-2-phenylpropionate | 57625-74-8 | C11H14O2 | 178.231 |
2-甲基-2-苯基丙酸乙酯 | ethyl 2-methyl-2-phenylpropionate | 2901-13-5 | C12H16O2 | 192.258 |
Alpha-甲基苯乙酸甲酯 | 2-phenylpropionic acid methyl ester | 31508-44-8 | C10H12O2 | 164.204 |
2-甲基-2-苯基丙醛 | 2,2-(dimethyl)-2-phenylacetaldehyde | 3805-10-5 | C10H12O | 148.205 |
—— | 2-Ethoxyethyl 2-methyl-2-phenylpropanoate | —— | C14H20O3 | 236.311 |
2-苯基丙醛 | 2-Phenylpropanal | 93-53-8 | C9H10O | 134.178 |
苯乙酸 | phenylacetic acid | 103-82-2 | C8H8O2 | 136.15 |
3-甲基-3-苯基丁烷-2-酮 | 2-methyl-2-phenylbutan-3-one | 770-85-4 | C11H14O | 162.232 |
2-甲基-2-苯基丙酰胺 | 2-methyl-2-phenyl-propanamide | 826-54-0 | C10H13NO | 163.219 |
中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
—— | 2-(4-ethylphenyl)-2-methylpropionic acid | —— | C12H16O2 | 192.258 |
2-(4-溴苯基)-2-甲基丙酸 | 2-(4-bromophenyl)-2-methylpropanoic acid | 32454-35-6 | C10H11BrO2 | 243.1 |
2,2-二甲基苯乙酸甲酯 | methyl 2-methyl-2-phenylpropionate | 57625-74-8 | C11H14O2 | 178.231 |
2-(4-乙酰苯基)-2,2-二甲基-乙酸 | 2-(4-acetyl-phenyl)-2-methyl-propionic acid | 857768-18-4 | C12H14O3 | 206.241 |
2-甲基-2-苯基丙酸乙酯 | ethyl 2-methyl-2-phenylpropionate | 2901-13-5 | C12H16O2 | 192.258 |
比拉斯汀中间体 | 2-(4-hydroxyethylphenyl)-2-methylpropionic acid ethyl ester | 1181267-31-1 | C14H20O3 | 236.311 |
—— | 2-(4-formylphenyl)-2-methylpropionic acid methyl ester | 84542-11-0 | C12H14O3 | 206.241 |
2-甲基-2-苯基丙烷-1-醇 | 2-methyl-2-phenyl-propan-1-ol | 2173-69-5 | C10H14O | 150.221 |
—— | 2-Ethoxyethyl 2-methyl-2-phenylpropanoate | —— | C14H20O3 | 236.311 |
2-甲基-2-苯基丙醛 | 2,2-(dimethyl)-2-phenylacetaldehyde | 3805-10-5 | C10H12O | 148.205 |
2-甲基-2-苯基丙酸叔丁酯 | tert-butyl 2-methyl-2-phenylpropanoate | 2901-24-8 | C14H20O2 | 220.312 |
—— | pent-4-enyl-2-methyl-2-phenylpropanoate | 1160843-11-7 | C15H20O2 | 232.323 |
2-甲基-2-(4-硝基苯基)-丙酸 | 2-methyl-2-(4-nitro-phenyl)-propionic acid | 42206-47-3 | C10H11NO4 | 209.202 |
—— | 2-(2-Hydroxyphenyl)isobutyric Acid | 86549-98-6 | C10H12O3 | 180.203 |
艾乐替尼中间体 | 2-(4-ethyl-3-iodophenyl)-2-methylpropionic acid | 1256584-73-2 | C12H15IO2 | 318.154 |
2-[4-(4-氯-丁基)-苯基]-2-甲基-丙酸 | 2-[4-(4-chloro-butyryl)-phenyl]-2-methyl-propionic acid | 169280-21-1 | C14H17ClO3 | 268.74 |
2-(4-溴苯基)-2-甲基丙烷-1-醇 | 2-(4-bromophenyl)-2-methylpropan-1-ol | 32454-37-8 | C10H13BrO | 229.117 |
非索非那定杂质1 | Methyl 2-[4-(1-hydroxy-4-chlorobutyl)phenyl]isobutyrate | 252022-32-5 | C15H21ClO3 | 284.783 |
4-[4-氯-1-丁酰基]-A,A-二甲基苯乙酸甲酯 | 2-[4-(4-Chloro-butyryl)-phenyl]-2-methyl-propionic acid, methyl ester | 154477-54-0 | C15H19ClO3 | 282.767 |
3-甲基-3-苯基丁烷-2-酮 | 2-methyl-2-phenylbutan-3-one | 770-85-4 | C11H14O | 162.232 |
(2-甲基-2-苯基-丙基)乙酸酯 | (2-acetoxy-1,1-dimethylethyl)benzene | 18755-52-7 | C12H16O2 | 192.258 |
4-(环丙基羰基)-alpha,alpha-二甲基苯乙酸甲酯 | 2-(4-cyclopropanecarbonyl-phenyl)-2-methyl-propionic acid, methyl ester | 880088-78-8 | C15H18O3 | 246.306 |
—— | 2-methyl-2-phenylpropanoyl chloride | 36293-05-7 | C10H11ClO | 182.65 |
2-甲基-2-苯基丙酰胺 | 2-methyl-2-phenyl-propanamide | 826-54-0 | C10H13NO | 163.219 |
4-(4-氯-1-氧代丁基)-alpha,alpha-二甲基苯乙酸乙酯 | 4-(4-chloro-1-oxobutyl)-α,α-dimethylbenzeneacetic acid ethyl ester | 76811-97-7 | C16H21ClO3 | 296.794 |
4-(1-羟基-2-甲基丙-2-基)苯甲酸 | 4-(1-hydroxy-2-methylpropan-2-yl)benzoic acid | 75492-21-6 | C11H14O3 | 194.23 |
CC bond cleavages of radical cations of 2-substituted benzothiazoline derivatives were investigated to determine the parameters controlling the fragmentation rate constants. In spite of the low oxidation potentials of the compounds, fragmentation rate constants greater than 1 × 106 s1 could be achieved through weakening of the fragmenting bond by substituents that stabilize the radical fragment and exert steric crowding. A quantitative assessment of the relative roles of radical stabilization vs. steric effects to weaken the fragmenting CC bond was achieved through DFT calculations. The calculated activation enthalpies matched reasonably well with the experimentally determined values. A thermokinetic analysis revealed that the fragmentations of benzothiazoline radical cations have relatively large intrinsic kinetic barriers, ascribed to the delocalized nature of the product radical and cation fragments. Interestingly, the same factors that lead to the large intrinsic barriers led, simultaneously, to large thermodynamic driving forces for the fragmentations, which should lead to lower activation barriers. These effects oppose each other kinetically and provide important insight into the design of fast radical ion fragmentation reactions.Key words: benzothiazoline, radical cation, fragmentation, steric effects, DFT.