chiral formylanionequivalent p-tolyl p-tolylthiomethyl sulphoxide (+)-(S)-(1) to the cyclopentenone derivative (2a) leads to the adduct (3a) in 45% yield with high diastereoselectivity. Reduction of (3a) gives the dithioacetal (4a), an interesting optically pure intermediate in the synthesis of 11-deoxy-ent-prostanoids. The high selectivity, contrasting with a lower selectivity observed using cyclopentenone
Irradiation of an aldehyde dithioacetal S-oxide gives the correspondingaldehyde. The mechanism of this photochemical transformation is discussed and its application to organic synthesis is also described.
Carbonyl protectedα-hydroxyaldehydes 3 were obtained in high diastereomeric purity through LiAlH4 reduction of corresponding β-oxosulfoxides 2 prepared via acylation of p-tolyl p-tolylthiomethyl sulfoxide 1.
Hajipour; Mohammadpoor Baltork; Kianfar, Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 1999, vol. 38, # 5, p. 607 - 610
作者:Hajipour、Mohammadpoor Baltork、Kianfar
DOI:——
日期:——
Nitric Acid in the Presence of Supported P<sub>2</sub>O<sub>5</sub> On Silica Gel Affords an Efficient and Mild System for Oxidation of Organic Compounds Under Solvent-Free Conditions
作者:Abdol R. Hajipour、Lian-Wang Guo、Arnold E. Ruoho
DOI:10.1080/15421400600786363
日期:2006.10.1
This paper describes an efficient and easy method for oxidation of alcohols 1 and sulfides 2 to their corresponding carbonyl compounds 3 and sulfoxides 4 with nitric acid in the presence of supported P2O5 on silica gel under solvent-free conditions in high yields.