Protection of primary amines as N- substited 2,5-dimethylpyrroles
作者:Stephen P. Breukelman、G. Denis Meakins、Malcolm D. Tirel
DOI:10.1039/c39820000800
日期:——
Protection of a primaryamine group against attack by organic or aqueous solutions of strong bases or nucleophiles is achieved by incoporation into an N- substituted 2,5-dimethylpyrrole system from which the amine group is regenerated by treatment with hydroxylamine hydrochloride.
Ketene dithioacetals as 1,3-dipolarophiles. Applications to the synthesis of cyclic amino acids
作者:William O. Moss、Robert H. Bradbury、Neil J. Hales、Timothy Gallagher
DOI:10.1039/c39900000051
日期:——
Intramolecular azide cycloaddition reactions of ketenedithioacetals provide a new route to cyclicaminoacids and a stereoselective synthesis of (2S,3S,4R)-3,4-dihydroxyproline (14) based on this methodology is described.
Discovery of novel, potent, selective, and orally active human glucagon receptor antagonists containing a pyrazole core
作者:Dong-Ming Shen、Edward J. Brady、Mari R. Candelore、Qing Dallas-Yang、Victor D.-H. Ding、William P. Feeney、Guoquiang Jiang、Margaret E. McCann、Steve Mock、Sajjad A. Qureshi、Richard Saperstein、Xiaolan Shen、Xinchun Tong、Laurie M. Tota、Michael J. Wright、Xiaodong Yang、Song Zheng、Kevin T. Chapman、Bei B. Zhang、James R. Tata、Emma R. Parmee
DOI:10.1016/j.bmcl.2010.11.074
日期:2011.1
The discovery and SAR study of a novel 1,3,5-pyrazole series of human glucagon receptorantagonists represented by are presented. Compound was selective and orallyactive in several in vivo preclinical models of type II diabetes.
介绍了以 为代表的新型1,3,5-吡唑系列人胰高血糖素受体拮抗剂的发现和SAR研究。该化合物在多种 II 型糖尿病体内临床前模型中具有选择性和口服活性。
Carbocyclizations employing 2-sily1-1,3-dithians
作者:Douglas B. Grotjahn、Niels H. Andersen
DOI:10.1039/c39810000306
日期:——
Dithianyl anions capable of carbocyclization via either direct or Michael addition to a carbonyl unit can be generated from 2-trimethylsilyl-1,3-dithians.
‘Cascade’ radical reactions in synthesis: Condensed thiophenes from ketenethioacetals.
作者:David C. Harrowven
DOI:10.1016/s0040-4039(00)73907-4
日期:1993.8
A novel radical centred tandemcyclisation - tandem fragmentation sequence is described for the direct convertion of ketenethioacetals e.g. 1, 6, 9, 12 and 16 into condensed thiophenes e.g. 2, 7, 10, 13 and 17.