Synthesis of all four isomers of (E)-4,5-dihydroxydec-2-enal using osmium-catalysed asymmetric dihydroxylation
摘要:
The enantioselective synthesis of the four possible isomers of (E)-4,5-dihydroxydec-2-enal, a cytotoxic product formed in peroxidised liver microsomal lipids, is accomplished via a Sharpless AD reaction alone or associated as appropriate with a regioselective epimerisation of one of the introduced hydroxy groups. (C) 1997 Elsevier Science Ltd.
Synthesis of all four isomers of (E)-4,5-dihydroxydec-2-enal using osmium-catalysed asymmetric dihydroxylation
摘要:
The enantioselective synthesis of the four possible isomers of (E)-4,5-dihydroxydec-2-enal, a cytotoxic product formed in peroxidised liver microsomal lipids, is accomplished via a Sharpless AD reaction alone or associated as appropriate with a regioselective epimerisation of one of the introduced hydroxy groups. (C) 1997 Elsevier Science Ltd.
Chemoenzymatic synthesis of (4S,5R)-5-hydroxy-γ-decalactone
作者:N.W Fadnavis、S.Kumara Vadivel、Mohd Sharfuddin
DOI:10.1016/s0957-4166(99)00411-5
日期:1999.9
2-hydroxy-3-oxooctanoate with immobilised baker's yeast at pH 4.0 yields anti-2R,3R-dihydroxy ester with high diastereoselectivity and enantioselectivity (de 70%, ee 80%) which is conveniently converted to (4S,5R)-5-hydroxy-γ-decalactone.
First stereoselective total synthesis and anticancer activity of new amide alkaloids of roots of pepper
作者:Ch. Srinivas、Ch.N.S. Sai Pavan Kumar、B. China Raju、V. Jayathirtha Rao、V.G.M. Naidu、S. Ramakrishna、Prakash V. Diwan
DOI:10.1016/j.bmcl.2009.08.056
日期:2009.10
The first stereoselectivetotalsynthesis of new natural amide alkaloids 1–3 have been achieved from commercially available starting materials. Wittig olefination, Sharpless asymmetric dihydroxylation, epoxidation, a trans regioselective opening of 2,3-epoxy alcohol, Horner–Wadsworth–Emmons (HWE) olefination and amide coupling are the key steps. The amide alkaloids 1–3 are evaluated for their anticancer