Compounds of formula (I) and methods for their preparation are disclosed. Further disclosed are methods of making biologically active compounds of formula (I) as well as pharmaceutically acceptable compositions comprising compounds of formula (I). Compounds of formula (I) as disclosed herein can be used in a variety of applications including use as antibacterial agents. They are especially active against aerobic Gram-negative organisms. The compounds have the following structure: or a pharmaceutically acceptable salt thereof wherein: “---”is a bond or is absent; A is a structure selected from the group consisting of i, ii, iii, and iv wherein “---” is a bond or is absent and “~~~” indicated points of attachment; and the other variables are defined in the description
Synthesis of vinylindoles and vinylpyrroles by the Peterson olefination or by use of the Nysted reagent
作者:Wayland E. Noland、Christopher L. Etienne、Nicholas P. Lanzatella
DOI:10.1002/jhet.313
日期:2011.3
Vinylindoles and vinylpyrroles were prepared from their corresponding aldehydes or ketones using the Peterson olefination, or by use of the Nysted reagent, a commercially available gem‐dimetallic compound. The two methods provide efficient and convenient access to these useful heterocyclic 1,3‐diene systems. J. Heterocyclic Chem., (2011).
Total Synthesis of the Proposed Structure of Aldingenin B
作者:Michael T. Crimmins、Colin O. Hughes
DOI:10.1021/ol3007259
日期:2012.4.20
The first enantioselective total synthesis of the proposed structure of aldingenin B is reported in 16 steps from known compounds. The stereochemistry at C5 and C6 were established by an asymmetricacetalaldol. Following a ring-closing metathesis, a selective, substrate-controlled hydrogen bond-mediated dihydroxylation provided control of the C2 and C3 stereocenters. Discrepancies in the spectroscopic
reaction of aldehydes or ketones through a domino process involving two ensuing steps in a single pot is realized. The compatibility of Matsubara's reagent and Wilkinson's complex give a combination that allows, under dihydrogen, the transformation of a carbonyl function into a methyl group. This new method is suitable to introduce an ethyl motif from aromatic and aliphatic aldehydes with total chemoselectivity