Mr. Iesce et al., PHOTOSENSITIZED OXIDATION OF FURANS .18. A SIMPLE METHOD FOR A ONE-POT SYNTHESIS OF FUNCTIONALIZED METHYL CIS-4-OXOALK-2-ENOATES, Synthesis, (4), 1995, pp. 439-443
Functionalized methyl cis-4-oxoalk-2-enoates 2 are synthesized in a on
e-pot procedure by singlet oxygen oxygenation of the corresponding 2-m
ethoxyfurans 1 in methanol and reduction of the resulting hydroperoxid
es 4 and 5 by the sulfides 6 which are selectively oxidized into the s
ulfoxides 7. The synthetic method has a wide range of applicability an
d affords compounds 2 stereoselectively and in good yields; concomitan
tly the sulfoxides 7 are obtained in excellent yields.