A Convenient Oxazole C-2 Protecting Group: The Synthesis of 4- and 5-Substituted Oxazoles via Metalation of 2-Triisopropylsilyloxazoles
作者:Ross A. Miller、Randi M. Smith、Benjamin Marcune
DOI:10.1021/jo051490m
日期:2005.10.1
Metalation of oxazoles at the 4 and 5 position was achieved after regioselective C-2 silyl protection. Removal of the protecting group was then accomplished under mild conditions allowing for a straightforward preparation of C-5 monosubstituted and C-4,5 disubstituted oxazoles. The first practical C-2 protecting group of oxazoles has been demonstrated.
Asymmetric Total Synthesis of (−)-(3<i>R</i>)-Inthomycin C
作者:Sandra Balcells、Maxwell B. Haughey、Johannes C. L. Walker、Laia Josa-Culleré、Christopher Towers、Timothy J. Donohoe
DOI:10.1021/acs.orglett.8b01370
日期:2018.6.15
A short (10 step) and efficient (15% overall yield) synthesis of the natural product (−)-(3R)-inthomycin C is reported. The key steps comprise three C–C bond-forming reactions: (i) a vinylogous Mukaiyama aldol, (ii) an olefin cross-metathesis reaction, and (iii) an asymmetric Mukaiyama–Kiyooka aldol. This route is notable for its brevity and has the advantage of lacking stoichiometric tin-promoted
Antibacterial Mimics of Natural Products by Side-Chain Functionalization of Bicyclic Tetramic Acids
作者:Laia Josa-Culleré、Alexander Pretsch、Dagmar Pretsch、Mark G. Moloney
DOI:10.1021/acs.joc.8b01453
日期:2018.9.7
Tetramic acids with unsaturated acyl chains are widely found in naturalproducts possessing a range of biological activities, and bicyclic tetramates represent a suitable scaffold to prepare simple mimics of such complex molecules. An efficient route to functionalize the C(6)-acyl group of a bicyclic tetramate was developed and utilized to prepare a small chemical library with a range of saturated