Rolf W. Saalfrank, and Martin Hanek
Enolate ions: synthetic equivalents of 1,3-dianions Convenient synthesis of substituted 3,4-dihydro-5-oxo-2h,5h-pyrano[3,4-b]pyrans
Tetrahedron Volume 44, Issue 15, 1988, Pages 4787-4792
Код: Выделить всё
http://dx.doi.org/10.1016/S0040-4020(01)86181-0