M. Yoshimatsu et S. Kinoshita, Direct lithiation and alkylation of trifluoromethyl enol ethers having a beta-sulfur substituent, CHEM PHARM, 48(1), 2000, pp. 145-147
The direct lithiation and alkylation of beta-sulfur-alpha-trifluoromethyl s
ubstituted enol ethers 1-3 proceeded to give the alkylated products 4a-f, 5
, 6a-c in moderate to high yields.