Tandem Retro-Michael Addition-Claisen Rearrangement-Intramolecular Cyclization: One-Pot Synthesis of Densely Functionalized Ethyl Dihydropyrimidine-4-carboxylates from Simple Building Blocks
Tandem Retro-Michael Addition-Claisen Rearrangement-Intramolecular Cyclization: One-Pot Synthesis of Densely Functionalized Ethyl Dihydropyrimidine-4-carboxylates from Simple Building Blocks
Tandem Retro-Michael Addition-Claisen Rearrangement-Intramolecular Cyclization: One-Pot Synthesis of Densely Functionalized Ethyl Dihydropyrimidine-4-carboxylates from Simple Building Blocks
作者:B. Naidu
DOI:10.1055/s-2008-1032088
日期:——
Pyrolysis of suitably functionalized oxadiazoline diesters in refluxing xylenes provided ethyl 1,2-disubstituted 5-hydroxy-6-oxo-1,6-dihydropyrimidine-4-carboxylates in moderate to good yields. Under thermal conditions, the oxadiazoline esters undergo a sequence of complex molecular reorganizations, namely retro-Michael addition, Claisen rearrangement, and cyclization, to produce the desired pyrimidinones.