Convenient synthesis of mesitylene-bridged hexaazamacrobicyclic compounds
作者:Krzysztof E. Krakowiak、Jerald S. Bradshaw
DOI:10.1002/jhet.5570330101
日期:1996.1
Two mesitylene-bridgedhexaazamacrobicyclic ligands 1 and 2 were prepared by a three-step process from available 2,4,6-tris(bromomethyl)mesitylene (9) and N, N'-di-p-tosylethylenediamine and N, N'-di-p-tosyl-1,3-diaminopropane. First, mono-BOC-protected ditosylamines 5 and 6 were prepared by treating the two diamines with BOC-O-BOC. These mono-BOC-protected diamines were treated with the tris(bromomethyl)-mesitylene
Facile synthesis of benzene-bridged azaoxamacrobicyclic ligands
作者:Jerald S. Bradshaw、Krzysztof E. Krakowiak
DOI:10.1002/jhet.5570350305
日期:1998.5
complexation with anions have been prepared. Intermediate triamines were prepared in one-step using a triple Mitsonobu reaction, thereby shortening the overall synthetic sequence. A previously prepared benzene-bridged hexaazamacrocycle was prepared in only four-steps.
Reductive Cyclization of Bromoenynamides with Alcohols as Hydride Source: Synthesis and Reactions of 2-Amidodienes
作者:Rebecca L. Greenaway、Craig D. Campbell、Helen A. Chapman、Edward A. Anderson
DOI:10.1002/adsc.201200703
日期:2012.11.26
Under basic conditions in alcoholic solvents, bromoenynamides undergo palladium-catalyzed cyclization to cyclic 2-amidodienes in good to excellent yields. This process represents the first use of an alcohol as a hydride source in an alkynecarbopalladation/termination sequence, with the site selectivity of the reduction showing a strong dependence on the tethering ring size (5–8), and the nature of
Thermal Removal of Boc-Protecting Groups During Preparation of Open-Chain Polyamines
作者:Krzysztof E. Krakowiak、Jerald S. Bradshaw
DOI:10.1080/00397919608003822
日期:1996.11
Per-N-tosylated 3,8-diaza-1,10-decanediamine (9), 4,9-diaza-1,12-dodecanediamine (spermine) (10) and 3,6,9,14,17,20-hexaaza-1,22-docosanediamine (11) were prepared by treating mono-BOG-protected, per-N-tosylated 1,2-ethanediamine (5), 1,3-propanediamine (6) and triethylenetetraamine (7), respectively, with 1,4-dibromobutane and removing the BOG-protecting groups at 100-120 degrees C.