845306-08-3

基本信息
5-溴吡啶-2-羧酸叔丁酯
5-溴吡啶-2-甲酸叔丁酯
5-溴吡啶-2-甲酸叔丁醇酯
5-Bromopicolinic acid tert-butyl ester
TERT-BUTYL 5-BROMOPYRIDINE-2-CARBOXYLATE 98
tert-Butyl 5-bromopyridine-2-carboxylate 98%
5-Bromopyridine-2-carboxylic acid t-butyl ester
5-Bromo-pyridine-2-carboxylic acid tert-butyl ester
5-Bromo-2-pyridinecarboxylic acid 1,1-dimethylethyl ester
2-Pyridinecarboxylic acid, 5-broMo-, 1,1-diMethylethyl ester
TERT-BUTYL 5-BROMOPYRIDINE-2-CARBOXYLATE 98 ISO 9001:2015 REACH
物理化學(xué)性質(zhì)
安全數(shù)據(jù)
制備方法

30766-11-1

75-65-0

845306-08-3
以2-羧酸-5-溴吡啶和叔丁醇為原料合成5-溴吡啶-2-甲酸叔丁酯的一般步驟如下:將2-羧酸-5-溴吡啶(118mg,0.58mmol)與吡啶(0.3mL,0.39mmol)和叔丁醇(1mL)混合,隨后加入對(duì)甲苯磺酰氯(262mg,1.38mmol)。將反應(yīng)混合物在40℃下攪拌10分鐘,然后在室溫下繼續(xù)攪拌2小時(shí)。反應(yīng)完成后,加入飽和碳酸氫鈉溶液(4mL)并攪拌5分鐘。接著加入二乙醚,將兩相混合物攪拌10分鐘。分離有機(jī)層,用鹽水洗滌,用無(wú)水硫酸鎂干燥,隨后在減壓下濃縮。通過(guò)硅膠柱色譜法純化殘余物,洗脫劑為戊烷:乙酸乙酯(100:0至80:20),得到5-溴吡啶-2-甲酸叔丁酯,為無(wú)色固體,收率73%(110mg)。產(chǎn)物經(jīng)1H-NMR(CDCl3,400MHz)確認(rèn):δ 1.65(s,9H),7.95(m,2H),8.88(m,1H)。質(zhì)譜(ES+)顯示m/z 539 [M2Na]+。
參考文獻(xiàn):
[1] Patent: EP1595881, 2005, A1. Location in patent: Page/Page column 62
[2] Patent: WO2005/14571, 2005, A1. Location in patent: Page/Page column 27
[3] Patent: WO2006/29906, 2006, A1. Location in patent: Page/Page column 16-17
[4] Patent: WO2012/143599, 2012, A1. Location in patent: Page/Page column 47-48