Synthese de composes dihydro-2,3 furanniques par hydroboration d'alcools β-acetyleniques
作者:Gilbert Dana、Bruno Figadère、Estera Touboul
DOI:10.1016/s0040-4039(01)80919-9
日期:1985.1
Hydroboration of β-acetylenic alcohols followed by NaOH/H2O2 oxidation leads to hemiacetals of γ-aldols which are easily dehydrated to 2,3-dihydrofuran compounds. The reaction gives good yields with hindered alcohols and its stereochemistry may be controlled during the organometallic synthesis of the starting alcohol.
β-炔醇的硼氢化反应,然后进行NaOH / H 2 O 2氧化,导致生成的γ-醛缩醛半缩醛容易脱水成2,3-二氢呋喃化合物。该反应在受阻醇的作用下具有良好的收率,并且可以在起始醇的有机金属合成过程中控制其立体化学。
Solid-Support Synthesis of 1,2-Diols and <i>γ</i>-Lactones Through Addition of <i>α</i>-(Benzoyloxy)crotylindium Reagents to Aldehydes
作者:Janine Cossy、Chrystelle Rasamison、Domingo Gomez Pardo、James A. Marshall
DOI:10.1055/s-2001-13367
日期:——
A procedure for the solid phase synthesis of 1,2-diols and γ-lactones from α-(hydroxy)crotylstannane has been developed through transmetalation with InBr3. A variety of 1,2-diols and γ-lactones were synthesized in satisfactory yields and, in some cases, with excellent diastereoselectivity. The products are formed free of tin contamination.
Substrate-Directed Diastereoselective Hydroformylations, 1. Substrate-Directed Diastereoselective Hydroformylation of Methallylic Alcohols – Development of an Efficient Catalyst-Directing Group for Rhodium-Catalyzed Hydroformylation
作者:Bernhard Breit
DOI:10.1002/jlac.199719970907
日期:1997.9
The development of an efficientcatalyst-directinggroup based on ortho-diphenylphosphanyl benzoate (o-DPPB) for the substrate-directed, diastereoselectivehydroformylation of methallylicalcohols 5 is described. The hydroformylation of methallylic o-DPPB esters 9 provides the corresponding syn-aldehydes 10 with diastereoselectivities of up to 96:4. A specific steric demand of the substituent at the