tert-BUTYL CHLORIDE → Methyl 5-(tert-butyl)-3-methylthiophene-2-carboxylate

温度

-78 °C

AlCl3 (15.60 g, 117 mMol) was suspended in CH2Cl2 (18 mL) and the mixture was cooled to −78° C. A solution of 12.28 g (78 mMol) of 101a in CH2Cl2 (9 mL) was added dropwise over 5 min. The mixture was stirred for 5 min. A solution of 8.9 mL (82 mMol) 2-chloro-2-methylpropane in CH2Cl2 (9 mL) was then added over 45 min, and the resulting mixture was stirred at −78° C. for 1 h. The reaction mixture was gradually warmed to room temperature and stirred for 24 h. The reaction mixture was then poured onto ice and extracted with CH2Cl2. The organic layer was dried with Na2SO4, and concentrated to an oil, which was purified on silica eluting with a gradient of CH2Cl2 in Hexane (0 to 10%) to afford 9.94 g (60%) of 101b.

1. stirringthe resulting mixture was stirred at −78° C. for 1 h
2. temperatureThe reaction mixture was gradually warmed to room temperature
3. stirringstirred for 24 h
4. additionThe reaction mixture was then poured onto ice
5. extractionextracted with CH2Cl2
6. dry with materialThe organic layer was dried with Na2SO4
7. concentrationconcentrated to an oil, which
8. customwas purified on silica eluting with a gradient of CH2Cl2 in Hexane (0 to 10%)

ORDレコード

ord-2849435e5aa3431abf5182b6d8c6eca7

出典データセット

uspto-grants-2015_03

DOI

10.6084/m9.figshare.5104873.v1

特許番号

US08975260B2