Aldol condensation reactions of tricarbonyliron complexes. Towards building blocks for the synthesis of carbomycin B/tylosin macrolide antibiotics and fluorinated analogs
被引:7
作者:
Franck-Neumann, M
论文数: 0引用数: 0
h-index: 0
机构:
Univ Strasbourg 1, CNRS, Lab Chim Organ Synthet, Inst Chim, F-67000 Strasbourg, FranceUniv Strasbourg 1, CNRS, Lab Chim Organ Synthet, Inst Chim, F-67000 Strasbourg, France
Franck-Neumann, M
[1
]
Geoffroy, P
论文数: 0引用数: 0
h-index: 0
机构:
Univ Strasbourg 1, CNRS, Lab Chim Organ Synthet, Inst Chim, F-67000 Strasbourg, FranceUniv Strasbourg 1, CNRS, Lab Chim Organ Synthet, Inst Chim, F-67000 Strasbourg, France
Geoffroy, P
[1
]
Gumery, F
论文数: 0引用数: 0
h-index: 0
机构:
Univ Strasbourg 1, CNRS, Lab Chim Organ Synthet, Inst Chim, F-67000 Strasbourg, FranceUniv Strasbourg 1, CNRS, Lab Chim Organ Synthet, Inst Chim, F-67000 Strasbourg, France
Gumery, F
[1
]
机构:
[1] Univ Strasbourg 1, CNRS, Lab Chim Organ Synthet, Inst Chim, F-67000 Strasbourg, France
Tricarbonyliron complexes of alpha-methoxyheptadienone 3 and octadienone 8 were reacted as silyl enol ethers with protected beta-hydroxypropanal and TiCl4, to give the syn-syn aldol condensation products 4 and 11 as major, isolated diastereomers (61 and 45%), Products 4 and 11 were converted into key intermediates of previous total syntheses of carbonolide B and tylonide, in a few steps, including the iron-directed reduction to syn diols and partial ozonolysis. The same methodology was used for the high yielding synthesis of a monofluorinated analog. (C) 2000 Elsevier Science Ltd. All rights reserved.