Synthesis of Cyclopentenones via Intramolecular HWE and the Palladium-Catalyzed Reactions of Allylic Hydroxy Phosphonate Derivatives
作者:Bingli Yan、Christopher D. Spilling
DOI:10.1021/jo8004028
日期:2008.7.1
Palladium-catalyzed decarboxylative rearrangement of nonracemic phosphono allylic acetoacetates, or the intermolecular allylic substitution of nonracemic phosphono allylic carbonates with tert-butyl acetoacetate followed by hydrolysis and decarboxylation, gave ω-ketovinyl phosphonates. A highly regioselective Wacker oxidation gave the ω,β-diketophosphonates which underwent intramolecular HWE reaction
Synthesis of the C(18)−C(34) Fragment of Amphidinolide C and the C(18)−C(29) Fragment of Amphidinolide F
作者:Sudeshna Roy、Christopher D. Spilling
DOI:10.1021/ol102345v
日期:2010.11.19
A convergent synthesis of the C(18)−C(34) fragment of amphidinolide C and the C(18)−C(29) fragment of amphidinolide F is reported. The approach involves the synthesis of the common intermediate tetrahydrofuranyl-β-ketophosphonate via cross metathesis, Pd(0)-catalyzed cyclization, and hydroboration−oxidation. The β-ketophosphonate was coupled to three side chain aldehydes using a Horner−Wadsworth−Emmons
报道了amphidinolide C的C(18)-C(34)片段和amphidinolide F的C(18)-C(29)片段的收敛合成。该方法涉及通过交叉复分解、Pd(0)-催化环化和硼氢化-氧化合成常见的中间体四氢呋喃基-β-酮膦酸酯。使用 Horner-Wadsworth-Emmons (HWE) 烯化反应将 β-酮膦酸酯偶联到三个侧链醛上,得到二烯酮,然后用l- selectride还原得到双环内酯 C 和 F 的片段。
Stereospecific Pd(O)-Catalyzed Malonate Additions to Allylic Hydroxy Phosphonate Derivatives: A Formal Synthesis of (−)-Enterolactone
作者:Bingli Yan、Christopher D. Spilling
DOI:10.1021/jo035795h
日期:2004.4.1
A combination of cross-metathesis and malonateaddition was applied to a formal synthesis of the mammalian lignan enterolactone 5. The cross-metathesis of alkene 6 and phosphonate 3a gave the substituted allylic phosphonate 3d. The palladium-catalyzed addition of malonate 10d to the allylic phosphonate 3d was stereospecific and highly regioselective and yielded the vinyl phosphonate 11d. The vinyl
Allylic hydroxy phosphonates: versatile chiral building blocks
作者:Antonette De la Cruz、Anyu He、Anchalee Thanavaro、Bingli Yan、Christopher D. Spilling、Nigam P. Rath
DOI:10.1016/j.jorganchem.2004.11.019
日期:2005.5
substituted amino phosphonates using a series of palladium-catalyzed reactions. The judicious selection of nitrogen nucleophile and palladium catalyst allow for excellent regio- and stereochemical control. Palladium(0)-catalyzed amine addition or tosyl carbamate rearrangement gives rise to the γ-substituted phosphonates, whereas, reaction of tosyl carbamates with palladium (II) and base gives oxazolidinones
Abstract The preparation of (S)- and (R)-1-(dimethoxyphosphoryl)allyl methyl carbonates is achieved on multigram scale from commercially available dimethyl phosphite and acrolein in three steps. The key steps involve an asymmetric Pudovik reaction and enzyme-catalyzed kineticresolution. The preparation of (S)- and (R)-1-(dimethoxyphosphoryl)allyl methyl carbonates is achieved on multigram scale from