The same type of reaction between the diazo compound and 1-methoxycyclohexene did not succeed, but uncatalyzed decomposition of the diazoester in the enol ether at 115" C afforded dihydrofuroate 6 (19% yield). Alcohol elimination from the dihydrofuroic esters 4a and 6, catalyzed by sulfuric acid in refluxing carbon tetrachloride, produced 0-furoates 7a8 and 8 (41% and 85% yields, respectively). When a rhodium-catalyzed reaction of the ...
