Total synthesis of 7-<i>des-O</i>-pivaloyl-7-<i>O</i>-benzylbryostatin 10
作者:Anthony P. Green、Simon Hardy、Alan T. L. Lee、Eric J. Thomas
DOI:10.1039/c7ob02129a
日期:——
the synthesis required selective hydroxyl deprotection and the introduction of the sensitive C19–C21 unsaturated keto-ester functionality. Unexpected selectivities were observed during studies of the hydroxyl group deprotections. In particular, cleavage of tri-isopropylsilyl ethers of the exocyclic primary allylic alcohols was observed in the presence of the triethylsilyl ether of the secondary alcohol
On the use of the modified Julia olefination for bryostatin synthesis
作者:Joanne V. Allen、Anthony P. Green、Simon Hardy、Nicola M. Heron、Alan T.L. Lee、Eric J. Thomas
DOI:10.1016/j.tetlet.2008.08.075
日期:2008.10
ModifiedJuliaolefination reactions using aldehyde 27 and the benzothiazol-2-yl sulfones 13 and 39 provide efficient syntheses of alkenes 28 and 42, which are advanced intermediates for syntheses of bryostatins.