(Alkoxyallyl)sulfones as enal β-anion equivalents. Synthesis of 5-substituted 2(5H)-furanones
摘要:
2(5H)-Furanones 14 may be prepared in a four-step sequence starting from (alkoxyallyl)sulfone 10 and aldehydes. Copyright (C) 1996 Elsevier Science Ltd
1-Benzyloxy-3-(p-tolylsulfonyl)propene as an acrolein β-anion equivalent. Synthesis of 4-substituted 2-butenolides
作者:Donald Craig、Christopher J. Etheridge、Alison M. Smith
DOI:10.1016/s0040-4039(00)60211-3
日期:1992.11
Lithiation of 1-benzyloxy-3-(p-tolylsulfonyl)propene 6 and reaction with aldehydes give alcohols 7. Sequential hydrolysis-cyclization, oxidation and DBU-mediated elimination of dine elements of p-TolSO2H gives 4-substituted 2-butenolides 10 in good overall yield.
Stereochemical studies on the 1,3-dipolar cycloaddition of 3,4,5,6-tetrahydropyridine 1-oxide to 2(5H)-furanones
作者:Pau Cid、Pedro de March、Marta Figueredo、Josep Font、Sergio Milán
DOI:10.1016/s0040-4039(00)92338-4
日期:1992.1
The 1,3-dipolar cycloaddition of 3,4,5,6-tetrahydropyridine 1-oxide, 1, to 2(5H)-furanones 2, 3, and 4 is investigated. Crucial nmr data are indicated to determine the conformational equilibria and stereochemistry of the adducts. The major products arise from exo transition states.