Short Stereoselective Synthesis of α-Substituted γ-Lactams
作者:Bhooma Raghavan、Rodney L. Johnson
DOI:10.1021/jo052212q
日期:2006.3.1
A concise, stereoselectivesynthesis of α-substitutedγ-lactams is reported. γ-Lactam scaffolds 2 and 3, possessing an Evans' chiral auxiliary and two types of N substituents, were successfully alkylated with different electrophiles to give α-substitutedγ-lactams with reasonable diastereoselectivities. The use of a masked carboxymethyl function off the lactam nitrogen provided a convergent means to
One-step synthesis of N-acetylcysteine and glutathione derivatives using the Ugi reaction
作者:Alexander G. Zhdanko、Anton V. Gulevich、Valentine G. Nenajdenko
DOI:10.1016/j.tet.2009.04.030
日期:2009.6
Cys–Gly, glutathione, and homoglutathione derivatives were synthesized by the Ugi four-component reaction using various benzylthio aldehydes and ketones as carbonyl building blocks. The scope and limitations of the method were investigated. Formation of imidazoline by-products in the Ugi reaction was discussed. 2,2,2-Trifluoroethanol was shown to be a superior reaction media than methanol in some reactions
Synthesis of porphyrazine-octaamine, hexamine and diamine derivatives
作者:Matthew J. Fuchter、L. Scott Beall、Sven M. Baum、Antonio Garrido Montalban、Efstathia G. Sakellariou、Neelakandha S. Mani、Todd Miller、Benjamin J. Vesper、Andrew J.P. White、David J. Williams、Anthony G.M. Barrett、Brian M. Hoffman
DOI:10.1016/j.tet.2005.03.090
日期:2005.6
diaminomaleonitriles gave access to a wide range of functionalized porphyrazine-octaamines and hexamines and norphthalocyaninediamines. Conversion of these macrocycles into metallic derivatives and studies of their electronic absorption, solubility and electrochemistry are described. These flexible tetraazaporphyrins show potential in a range of applications including biomedical agents, novel charge–transfer complexes
Three-Component, One-Flask Synthesis of Rhodanines (Thiazolidinones)
作者:Alexander M. Jacobine、Gary H. Posner
DOI:10.1021/jo201561t
日期:2011.10.7
5-(Z)-Alkylidene-2-thioxo-1,3-thiazolidin-4-ones (rhodanine derivatives) were prepared by reaction of in situ generated dithiocarbarnates with recently reported racemic alpha-chloro-beta,gamma-alkenoate esters. This multi-component sequential transformation performed in one reaction flask represents a general route to this medicinally valuable class of sulfur/nitrogen heterocycles. Using this convergent procedure, we prepared an analogue of the drug epalrestat, an aldose reductase inhibitory rhodanine.
Synthetic studies directed toward the liposidomycins: Preparation and reactions of serine-derived epoxides
作者:William J. Moore、Frederick A. Luzzio
DOI:10.1016/00404-0399(50)1349-m
日期:1995.9
The preparation of an oxiranyl serine derivative which will he incorporated into the diazepanone fragment of the liposidomycin B core subunit is described. Reactions of the epoxide with nitrogen nucleophiles afforded the 1,2-(O,N-protected)-4-N-functionalized-3-butanols in modest to good yields. A Mosher ester analysis of the alcohol resulting from azide promoted oxirane ring opening is also discussed.