Efficient microwave assisted access to chiral O-(α-protected-aminoacyl)steroids
作者:Alan R. Katritzky、Parul Angrish
DOI:10.1016/j.steroids.2006.04.003
日期:2006.8
Chiral O-(alpha-protected-amino acyl)steroids 4a-f, 6a-b, 8 and 4a+4d and O-(alpha-protected-dipeptidoyl) steroids 12a,b are conveniently prepared under microwave irradiation in isolated yields of 65-96%, with complete chirality retention. The reaction utilized readily available N-(Z-alpha-aminoacyl)benzotriazoles 2a-f and Z-dipeptidoylbenzotriazole 11, with naturally occurring steroidal alcohols 3,5,7,9. (c) 2006 Elsevier Inc. All rights reserved.
A benzotriazole-mediated route to protected marine-derived hetero-2,5-diketopiperazines containing proline
作者:Olivier Nsengiyumva、Sadra Hamedzadeh、James McDaniel、Jocelyn Macho、Grant Simpson、Siva S. Panda、Khanh Ha、Iryna Lebedyeva、Hassan M. Faidallah、Manal Metgen AL-Mohammadi、C. Dennis Hall、Alan R. Katritzky
DOI:10.1039/c5ob00023h
日期:——
Dipeptidoyl benzotriazolides containing proline were cyclized by triethylamine into 2,5-diketopiperazines.