An efficient synthesis of cyclic urethanes from Boc-protected amino acids through a metal triflate-catalyzed intramolecular diazocarbonyl insertion reaction
作者:Jae-Chul Jung、Mitchell A. Avery
DOI:10.1016/j.tetlet.2006.08.111
日期:2006.11
A simple and efficient synthesis of cyclic urethanes and related oxazinanones 1a–l from diazoketones 3a–l is described. The transformation involves generation of carbenes by activation of diazo groups using metal triflates in intramolecular diazocarbonyl insertionreactions in high overall yields.
A simple synthesis of sulfonamides 4–22 as novel histone deacetylase (HDAC) inhibitors is described. The key synthetic strategies involve N–sulfonylation of L–proline benzyl ester hydrochloride (2) and coupling reaction of N–sulfonyl chloride 3 with amines in high yields. It was found that several compounds showed good cellular potency with the most potent compound 20 exhibiting an IC50 = 2.8 μM in vitro.