Allyl alk-2-ynoates can be readily converted into alk-2-ynoic acids by the reaction with morpholine in the presence of a palladium-diphenylphosphinopropane catalyst, thus providing the chemical deprotection method of allyl ester of 2,2,3,3-tetradehydro PGE1.
S. Okamoto, N. Ono, K. Tani, Y. Yoshida and F. Sato, J. Chem. Soc., Chem. Commun., 1994, 279 DOI: 10.1039/C39940000279
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