The shortest synthesis of optically active Geissman-Waiss lactone, a key synthetic intermediate for necine bases
作者:Hiroki Takahata、Yasunori Banba、Takefumi Momose
DOI:10.1016/s0957-4166(00)82169-2
日期:1991.1
A short synthesis of (+)-(1R,5R)-2-oxa-6-azabicyclo[3.3.0]octan-3-one (the Geissman-Waiss lactone, 1) by palladium (II)-catalyzed intramolecular aminocarbonylation of (R)-N-benzyloxycarbonyl-3-hydroxy-4-pentenylamine (4) available from the Katsuki-Sharpless kinetic resolution of racemic 4 has been accomplished.
A facile synthesis of (−)- and (+)-Geissman–Waiss lactone via intramolecular Rh(II)-carbenoid mediated C–H insertion reaction: synthesis of (1R,7R,8R)-turneforcidine
作者:Andrew G.H Wee
DOI:10.1016/s0040-4039(00)01664-6
日期:2000.11
intramolecular C–H insertion reaction in chiral non-racemic diazoacetates (−)-6 and (+)-8 catalyzed by chiral Rh2(MPPIM)4 proceeded efficiently, with excellent regioselectivity and cis-diastereoselectivity, to give (−)- and (+)-Geissman–Waiss lactone, 4b, respectively. Bicyclic lactone (−)-4b was used in the synthesis of the necine base (−)-turneforcidine 3.
Using whole cell Baeyer-Villiger biooxidation as a key step and depending on the choice of the biocatalyst E. coli TOP10[pQR239] or Acinetobacter TD63}, the synthesis of nearly enantiopure N-protected (1R,5R)-(-)-Geisman-Waiss lactone (92% ee) or its (1R,5S)-(-) regioisomer (98% ee) be performed. (c) 2005 Elsevier Ltd. All rights reserved.
Synthesis of (R)- and (S)-3-(tert-butyldimethylsilyloxy)-1-pyrroline N-oxides — chiral nitrones for synthesis of biologically active pyrrolidine derivative, Geissman-Waiss lactone
Tungstate-catalyzed oxidation of O-tert-butyldimethylsilyl (O-TBDMS) protected (R)-3-hydroxypyrrolidine ((R)-2), derived from trans-4-hydroxy-L-proline, gave O-TBDMS protected (R)-3-hydroxy-1-pyrroline N-oxide ((R)-1), which is a new chiral precursor for the synthesis of Geissman-Waiss lactone. The enantiomeric nitrone (S)-1 was also prepared by the oxidation of (S)-2 derived from L-malic acid. (C) 1998 Elsevier Science Ltd. All rights reserved.
Asymmetric intramolecular Pd(II)-catalysed amidocarbonylation of unsaturated amino alcohols
作者:Peter Koóš、Ivan Špánik、Tibor Gracza
DOI:10.1016/j.tetasy.2009.10.024
日期:2009.12
The first example of an asymmetric carbonylative bicyclisation of racemic N-protected 1-amino-pent-4-ene-3-ols (+/-)-1 catalysed by palladium(II) with chiral bis(oxazoline) ligands was investigated. The kinetic resolution of (+/-)-1 in the presence of chiral catalyst, p-benzoquinone in acetic acid under carbon monoxide atmosphere afforded enantiomerically enriched derivatives of 2-oxa-6-azabicyclo[3.3.0]octan-3-ones (R,R)-2 and (S,S)-2, respectively. (C) 2009 Elsevier Ltd. All rights reserved.