Third-Generation Immucillins: Syntheses and Bioactivities of Acyclic Immucillin Inhibitors of Human Purine Nucleoside Phosphorylase
作者:Keith Clinch、Gary B. Evans、Richard F. G. Fröhlich、Richard H. Furneaux、Peter M. Kelly、Laurent Legentil、Andrew S. Murkin、Lei Li、Vern L. Schramm、Peter C. Tyler、Anthony D. Woolhouse
DOI:10.1021/jm801421q
日期:2009.2.26
ImmH (1) and DADMe-ImmH (2) are potent inhibitors of human purinenucleoside phoshorylase (PNP), developed by us and currently in clinical trials for the treatment of a variety of T-cell related diseases. Compounds1 and 2 were used as templates for the design and synthesis of a series of acyclic immucillin analogues (8−38) in order to identify simplified alternatives to 1 and 2. SerMe-ImmG (8) and
Stereoselective benzylic α-acylamino radical cyclisation: a model study for the Tacaman indole alkaloid skeleton
作者:Rainer Clauss、Roger Hunter
DOI:10.1039/a602932i
日期:——
Radical cyclisation with tributyltin hydride of the
α-phenylsulfanyl lactam 6, prepared in nine steps from
D-ribose via the corresponding phthalimide, gives
the all-cis tetrahydropyrido[2,1-a]isoindolone 7
stereoselectively as the major diastereomer. The structure of the
product is established by 1H NMR spectroscopy and
corroborated by formation of the cis-lactone 8. The
diastereoselectivity is shown to be controlled by the
allylic/homoallylic cis-ketal group, and a transition state is
proposed. The sequence constitutes the first simple model study for C/D
ring fusion of the Tacaman indole alkaloid skeleton via the
relatively unexplored C-3âC-14 bond disconnection.