ReBr(CO)5-catalyzed sequential addition–cyclization of 1,3-dicarbonyl compounds with electron-deficient internal alkynes affording trisubstituted 2H-pyran-2-ones
作者:Wen-Guo Zhao、Ruimao Hua
DOI:10.1016/j.tet.2007.09.038
日期:2007.11
The reaction of 1,3-dicarbonyl compounds such as acetoacetate, acetylacetone, dibenzoylmethane, and benzoylacetate with electron-deficient internal alkynes in the presence of catalytic amount of ReBr( CO) 5 in toluene under neutral conditions resulted in the formation of 4,5,6-trisubstituted 2H-pyran-2-ones in moderate to high yield. The reaction took place via a two-step sequence including the rhenium(I)-catalyzed addition of the activated methylenes to alkynes to give enolic 2-alkenyl derivatives, and subsequently dealcoholic cyclization to form 2H-pyran-2-one derivatives. (c) 2007 Elsevier Ltd. All rights reserved.
Covarrubias-Zuniga, Adrian; Maldonado, Luis A.; Diaz-Dominguez, Jose, Synthetic Communications, 1998, vol. 28, # 9, p. 1530 - 1538
作者:Covarrubias-Zuniga, Adrian、Maldonado, Luis A.、Diaz-Dominguez, Jose
DOI:——
日期:——
Copper oxide catalyzed domino process for the synthesis of substituted 2H-pyran-2-ones and polyhydroxy coumarin derivatives