Wh. Chen et al., REACTION OF P-NITROPHENYLSULFONYLACETATE WITH ALPHA,BETA-UNSATURATED ESTERS UNDER SOLID-LIQUID PHASE-TRANSFER CONDITIONS, Gaodeng xuexiao huaxue xuebao, 16(9), 1995, pp. 1410-1414
The reaction of p-nitrophenylsulfonylacetate with alpha,beta-unsaturat
ed esters under solid-liquid phase transfer conditions (K2CO3/DMF/TEBA
) gave the unexpected Michael addition-rearrangement products. For exa
mple, the reaction of p-nitrophenylsulfonylacetate with methyl methacr
ylate resulted in the formation of 2-methyl-2-(p-nitrophenyl) glutarat
e, presumably through the Michael adduct, which might rearrange to an
intermediate, further lose sulfur dioxide and then led to the final pr
oduct.