作者:Agnes Pommier、Jean-Marc Pons、Philip J. Kocienski
DOI:10.1021/jo00127a045
日期:1995.11
A key step in the first total synthesis of the potent pancreatic lipase inhibitor (-)-lipstatin (1) is a diastereoselective Lewis acid-promoted [2 + 2] cycloaddition reaction between n-hexyl(trimethylsilyl)ketene (4) and (R)-(-)-(Z,Z)-3-[(tert-butyldimethylsilyl)oxy]5,8-tetradecadienal (3), which is prepared from dimethyl (S)-(-)-malate.
A synthesis of (−)-tetrahydrolipstatin
作者:Jean-Marc Pons、Philip Kocieński
DOI:10.1016/s0040-4039(00)99592-3
日期:——
An approach to the synthesis of (–)-lipstatin by Wittig reaction and Lewis acid-promoted [2 + 2] cycloaddition
The beta-lactone moiety of (-)-lipstatin 1, a potent inhibitor of pancreatic lipase, is prepared via a Lewis acid-promoted [2 + 2] cycloaddition between hexyltrimethylsilyl ketene 3 and the (Z,Z)-dienic aldehyde 4, obtained from hexanal by two stereoselective Wittig reactions.
PONS, JEAN-MARC;KOCIENSKI, PHILIP, TETRAHEDRON LETT., 30,(1989) N4, C. 1833-1836
The relative stereochemistry of the substituents of the oxetanone ring in the title compound, C26H52O3Si2, prepared by the highly diastereoselective [2+2] cycloaddition of a silylketene and a 3-alkoxy-substituted aldehyde, has been established.