Study of syntheses and specific rotations of (S)-3-phenylhexan-3-ol and its derivatives

The determination of enantiomer composition of 1-((3-chlorophenyl)-(phenyl)methyl) amine and 1-((3-chlorophenyl)(phenyl)-methyl) urea (Galodif) by NMR spectroscopy, chiral HPLC, and polarimetry

For the first time, a method for enantiomer resolution of the anticonvulsant Galodif (1-((3-chlorophenyl)(phenyl)methyl) urea) by chiral HPLC was developed, whereas the enantiomeric composition of 1-((3-chlorophenyl)(phenyl)methyl) amine-precursor in Galodif synthesis-cannot be resolved by this method. However, starting 1-((3-chlorophenyl)(phenyl)methyl) amine quantitatively forms diastereomeric N-((3-chlorophenyl)(phenyl)methyl)-1-camphorsulfonamides in reaction with chiral (1R)-(+)- or (1S)-(-)-camphor-10-sulfonyl chlorides. The diastereomeric ratio of obtained camphorsulfonamides can be easily determined by NMR ¹ H and ¹³ C spectroscopy. The DFT calculations of specific rotation of Galodif enantiomers showed good agreement with experimental data. The absolute configuration of enantiomers was proposed for the first time.

Cytotoxic polyphenols from the marine-derived fungus Penicillium expansum

Two new polyphenols containing both phenolic bisabolane sesquiterpenoid and diphenyl ether units, expansols A (1) and B (2), and two new phenolic bisabolane sesquiterpenoids, (S)-(+)-11-dehydrosydonic acid (3) and (7S,11S)-(+)-12-acetoxysydonic acid (4), along with two known compounds, (S)-(+)-sydonic acid (5) and diorcinol (6), were isolated from the metabolites of the marine-derived fungus Penicillium expansum 091006 endogenous with the mangrove plant Excoecaria agallocha. On the basis of spectroscopic analysis, chemical transformation, and theoretical calculation, the structures of 1-4 were elucidated as (S)-(+)-2-[3-hydroxy-4-(2- methoxy-6-methylheptan-2-yl)benzyl]-5-(3-hydroxy-5-methylphenoxy)-3-methylphenol, S-(+)-2-[3-hydroxy-4-(2-hydroxy-6-methylheptan-2-yl)benzyl]-5-(3-hydroxy-5-methylphenoxy)-3-methylphenol, (S)-(+)-3-hydroxy-4-(2-hydroxy-6-methylhept-6-en-2-yl)benzoic acid, and 4-[(2S,6S)-7-acetoxy-2-hydroxy-6-methylheptan-2-yl]-3-hydroxybenzoic acid, respectively. Expansol A (1) exhibited moderate cytotoxicity against the HL-60 cell line with an IC(50) value of 15.7 microM, and expansol B (2) inhibited the proliferation of A549 and HL-60 cells with IC(50) values of 1.9 and 5.4 microM, respectively.