Synthesis of (+)-Methyl (R,E)-6-Benzyloxy-4-hydroxy-2-hexenoate and Its Mesylate Derivative
摘要:
Methyl (E)-6-benzyloxy-4-hydroxy-2-hexenoate is prepared in both racemic and enantiopure form through reaction between (2-benzyloxy)ethyloxirane and the dianion of phenylselenoacetic acid followed by esterification with diazomethane, oxidation to the selenoxide and subsequent pyrolysis in 72% overall yield.
Reactions of cyclic nitrones with (<i>E</i>
)-γ-hydroxy- and (<i>E</i>
)-γ-alkoxy-α,β-unsaturated esters
作者:P. de March、M. Figueredo、J. Font、M. Monsalvatje
DOI:10.1002/recl.19951140803
日期:——
The 1,3-dipolarcycloadditions of 2,3,4,5-tetrahydropyridine 1-oxide (1) and 3,4-dihydro-2H-pyrrole 1-oxide (2) to methyl (E)-6-(benzyloxy)-4-hydroxy-2-hexenoate (3) and methyl (S)-(E)-3-(2,2-dimethyl-1,3-dioxolan-4-yl)propenoate (4) yield predominantly the adducts derived from endo transition states with antifacial approaches.