Designer Discodermolide Segments via Ozonolysis of Vinyl Phosphonates
摘要:
To apply our collection of enantiopure 7-ring vinyl sulfones to probe the anticancer SAR of a series of computer-designed (+)-discodermolide analogs, the ozonolytic reactivity of transposed cyclic vinyl phosphonates was explored. Successful preparation of the desired aldehyde-esters and lactones from vinyl phosphonates via an oxidative cleavage-phosphite/methanol exchange sequence is described.
Facile Solid‐Phase Synthesis of Cycloalkylphosphonates and 1‐Cycloalkenylphosphonates Using Polymer‐Supported Phenylsulfonylmethylphosphonates
作者:Xiao‐Ling Liu、Shou‐Ri Sheng、Wei Zhou、Qin‐Ying Wang、Xiao‐Lan Zhang、Bin Gong
DOI:10.1080/00397910600978515
日期:2007.1.1
Abstract A facile procedure for the solid‐phasesynthesis of cycloalkylphosphonates and 1‐cycloalkenylphosphonates in good yields and high purities using polystyrene‐supported phenylsulfonylmethylphosphonates with traceless sulfone linker strategy is described.
The palladium-catalyzed acetoxylation of cyclic dialkyl allyl phosphonates is effected using palladium chloride as catalyst, in the presence of isopentyl nitrite in acetic acid under an oxygen atmosphere. The proposed mechanism for the reaction involves a palladium nitro–nitroso redox couple.
Banerjee, Shyamal; Engel, Robert; Axelrad, George, Phosphorus and Sulfur and the Related Elements, 1983, vol. 15, p. 15 - 18
作者:Banerjee, Shyamal、Engel, Robert、Axelrad, George
DOI:——
日期:——
Conversion of Cyclic Vinyl Sulfones to Transposed Vinyl Phosphonates
作者:Mohammad N. Noshi、Ahmad El-awa、Eduardo Torres、Philip L. Fuchs
DOI:10.1021/ja072890p
日期:2007.9.1
Functionalized cyclic vinyl sulfones were directly converted to the "polarity reversed" vinyl phosphonates through an efficient one pot procedure. Ozonolysis of these vinyl sulfones and vinyl phosphonates furnish complementary sets of termini-differentiated ester-aldehydes. This strategy has been applied for preparation of segments needed for the synthesis of Aplyronine A. The scope and limitations of this transformation were defined.
BANERJEE, SHYAMAL;ENGEL, R.;AXELRAD, G., PHOSPH. AND SULFUR, 1983, 15, N 1, 15-18