Fluorinated acrylates via alkoxycarbonylation of 1-alkynes with fluorinated alcohols
摘要:
The system formed by combining in situ Pd(OAc)2 with (2-pyridyl)diphenylphosphine (PyPPII2) and CH3SO3H catalyzes efficiently the carbonylation of terminal alkynes (phenylacetylene or 1-hexyne) with alcohols having perfluorinated segments of the type CF3(CF2)(m)(CH2)(n)-OH (m=1 or 3, n=1, 2 or 3) or with pentafluorophenol. Good carbonylation rates accompanied by high regioselectivity towards acrylate ester formation are obtained under mild reaction conditions (T=60-80 degrees C, P(CO)=30 atm). The influence of the CO pressure, the catalyst composition, the temperature and the number (n) of protonated methylene groups on the catalysis has been studied. (C) 2014 Elsevier Ltd. All rights reserved.
The system formed by combining in situ Pd(OAc)2 with (2-pyridyl)diphenylphosphine (PyPPII2) and CH3SO3H catalyzes efficiently the carbonylation of terminal alkynes (phenylacetylene or 1-hexyne) with alcohols having perfluorinated segments of the type CF3(CF2)(m)(CH2)(n)-OH (m=1 or 3, n=1, 2 or 3) or with pentafluorophenol. Good carbonylation rates accompanied by high regioselectivity towards acrylate ester formation are obtained under mild reaction conditions (T=60-80 degrees C, P(CO)=30 atm). The influence of the CO pressure, the catalyst composition, the temperature and the number (n) of protonated methylene groups on the catalysis has been studied. (C) 2014 Elsevier Ltd. All rights reserved.