The palladium-catalyzed, two-step, one-potborylation/Suzuki coupling (BSC) reaction was developed to synthesize sterically hindered 2,2'-disubstituted biphenyl and phenyl-indole compounds in a short, simple, and efficient manner from two easily accessible aryl halides. High yields can be obtained by choosing properly both components according to their rough electronic properties. The illustration
Crystallization-Induced Dynamic Resolution toward the Synthesis of (<i>S</i>)-7-Amino-5<i>H</i>,7<i>H</i>-dibenzo[<i>b</i>,<i>d</i>]-azepin-6-one: An Important Scaffold for γ-Secretase Inhibitors
作者:Sukhen Karmakar、Vijay Byri、Ashvinikumar V. Gavai、Richard Rampulla、Arvind Mathur、Anuradha Gupta
DOI:10.1021/acs.oprd.6b00207
日期:2016.10.21
An enantioselective synthesis of (S)-7-amino-5H,7H-dibenzo[b,d]azepin-6-one (S-1) is described. The key step in the sequence involved crystallization-induced dynamic resolution (CIDR) of compound 7 using Boc-D-phenylalanine as a chiral resolving agent and 3,5-dichlorosalicylaldehyde as a racemization catalyst to afford S-1 in 81% overall yield with 98.5% enantiomeric excess.
Atropisomeric Properties of the Dibenzo[<i>b</i>,<i>d</i>]azepin-6-one Nucleus
Dibenzo[b,d]azepin-6-ones (2a,b) were separated by chiral HPLC into the aR- and aS-atropisomers with high stereochemical stability, and methylation at C7 of 2a stereoselectively gave the (aR*,7R*) isomer (4a), which converted to the thermodynamically stable (aS*,7R*) atropisomer (5a) after heating.