Enantiomerically pure cyclopropylboronic esters: auxiliary- versus substrate-control
作者:Jörg Pietruszka、Andreas Witt
DOI:10.1039/b006970l
日期:——
Stable, enantiomericallypurecyclopropylboronicesters are synthesized from alkynes by a hydroboration–cyclopropanation sequence. The direct hydroboration—utilizing 1,3,2-dioxaborolane 4—is most convenient, however, with more functionalized side-chains it failed to give the desired intermediates. Using the more reactive dicyclohexylborane, followed by oxidation and transesterification, is a good alternative
First total synthesis of the marine illudalane sesquiterpenoid alcyopterosin EElectronic supplementary information (ESI) available: experimental details. See http://www.rsc.org/suppdata/cc/b2/b209573d/
作者:Bernhard Witulski、Axel Zimmermann、Nicholas D. Gowans
DOI:10.1039/b209573d
日期:2002.11.29
The first synthesis of the marine illudalane sesquiterpenoid alcyopterosin E was accomplished through a concise ABC ring-formation strategy using a rhodium(I)-catalysed intramolecular alkyne cyclotrimerisation as key connection.
Tetrahydrofuran amino acid-containing gramicidin S analogues with improved biological profiles
作者:Sudip Pal、Gajendra Singh、Shyam Singh、Jitendra Kumar Tripathi、Jimut Kanti Ghosh、Sudhir Sinha、Ravi Sankar Ampapathi、Tushar Kanti Chakraborty
DOI:10.1039/c5ob00622h
日期:——
Replacement of thed-Phe-Pro units of GS with novel C6-Bn-substituted tetrahydrofuran amino acid minimized its cytotoxicity while preserving its antimicrobial activity, with a few analogs showing selective anti-TB activity as well.