Synthesis of Enantiomerically Pure β-Lactones by the Tandem Aldol−Lactonization. A Highly Efficient Access to (3S,4S)-3-Hexyl-4- [(2S)-2-hydroxytridecyl]oxetan-2-one, the Key Intermediate for the Enzyme Inhibitors Tetrahydrolipstatin and Tetrahydroesterastin,1
Synthesis of Enantiomerically Pure β-Lactones by the Tandem Aldol−Lactonization. A Highly Efficient Access to (3S,4S)-3-Hexyl-4- [(2S)-2-hydroxytridecyl]oxetan-2-one, the Key Intermediate for the Enzyme Inhibitors Tetrahydrolipstatin and Tetrahydroesterastin,1
Method for synthesizing oxetan-2-ones and intermediates for their
申请人:——
公开号:US05902886A1
公开(公告)日:1999-05-11
A method is described for the synthesis of oxetan-2-ones comprising protection of the hydroxy group of an hydroxy ester with an acid-labile acetal protecting group, reduction of this O-protected hydroxy ester to an O-protected hydroxy aldehyde, condensation of this aldehyde with a metal enolate of an activated carboxylic acid derivative and spontaneous deprotection of the hydroxy group during the acidic workup procedure. Using the new O-protected hydroxy aldehydes as intermediates the oxetan-2-ones can be obtained after separation in diastereomerically and enantiomerically pure form, in a remarkably reduced number of steps, and in a significantly improved overall yield.
Synthesis of Enantiomerically Pure β-Lactones by the Tandem Aldol−Lactonization. A Highly Efficient Access to (3<i>S</i>,4<i>S</i>)-3-Hexyl-4- [(2<i>S</i>)-2-hydroxytridecyl]oxetan-2-one, the Key Intermediate for the Enzyme Inhibitors Tetrahydrolipstatin and Tetrahydroesterastin<sup>,</sup><sup>1</sup>