P<sub>2</sub>O<sub>5</sub>-Promoted Efficient and Diastereoselective Synthesis of Substituted 5-Methylene-dihydropyran-2,6-diones and 3-Methylene-3,4-dihydropyran-2-ones
作者:Vijay Singh、Sudharshan Madapa、Sanjay Batra
DOI:10.1080/00397910802028879
日期:2008.6.20
A simple, efficient, and diastereoselective synthesis of 5-methylene-dihydropyran-2,6-diones and 3-methylene-3,4-dihydropyran-2-ones from substrates afforded by the S(N)(2) reaction between the acetyl derivatives of the Baylis-Hillman adducts and methylacetoacetate or acetylacetone or benzoyl acetone via saponification followed by P(2)O(5)-mediated cyclization is described.
Expedient synthesis of highly substituted α-pyrones from Baylis–Hillman adducts and their conversion to poly-substituted aromatics
作者:Eun Sun Kim、Ko Hoon Kim、Sung Hwan Kim、Jae Nyoung Kim
DOI:10.1016/j.tetlet.2009.06.124
日期:2009.9
An efficient synthetic protocol of fully substituted α-pyrones has been developed starting from the Baylis–Hillman adducts. Subsequent Diels–Alder reaction of the α-pyrones and DMAD produced poly-substituted aromaticcompounds in high yields.