Conformationally constrained nonpeptide β-turn mimetics of enkephalin
摘要:
The design synthesis and in vitro biological analysis of a family of conformationally constrained nonpeptide mimetics incorporating a 4-->1 beta-turn prosthetic unit to examine the proposed biological significance of this conformer is described.
Unexpected alkoxyl migration in the reaction of silyl ketene acetals with p-toluenesulfonyl azide
作者:Yong Xu、Shizheng Zhu
DOI:10.1016/s0040-4020(01)00283-6
日期:2001.4
The reaction of p-toluenesulfonylazides with several silyl ketene acetals has been investigated. 1-Trimethylsilyloxy-ethylene reacted with TsN3 to give a good yield of N-p-toluenesulfonyl substituted glycinates exclusively. However, during the reaction of 1-trimethylsilyloxy-propene with TsN3, an unexpected alkoxyl migration occurred to give N-acylsulfonyl amides; other products, N-p-toluenesulfonyl
作者:Melissa L. Grachan、Matthew T. Tudge、Eric. N. Jacobsen
DOI:10.1002/anie.200704439
日期:2008.2.8
1,2-Cyclic Sulfamidates as Versatile Precursors to Thiomorpholines and Piperazines
作者:Andrew J. Williams、Suda Chakthong、Diane Gray、Ron M. Lawrence、Timothy Gallagher
DOI:10.1021/ol027418h
日期:2003.3.1
Graphics1,2-Cyclic sulfamidates undergo regiospecific nucleophilic displacement with either methyl thioglycolate or a-amino esters, followed by lactamization (thermal, base-mediated, or cyanide-catalyzed), to give thiomorpholin-3-ones and piperazin-2-ones.