Br+-induced cyclization of γ,δ-unsaturated ketones: A new approach to bromopyrane derivatives
摘要:
3,5-dibromo-3,4-dihydro-2,2-dimethyl-(2H)-pyrans 2, are obtained through a simple and new procedure involving a bromoenol-etherification of gamma,delta-unsaturated ketones 1; the key step is the formation of mono-bromopyran intermediate A.
we report the generation of iminyl radicals through photocatalytic deoxygenation of oximes with trivalent phosphine. The hydroiminationreaction proceeded via β-scission of a phosphoranyl radical, followed by 5-exo-trig cyclization of the resulting iminyl radical. This protocol transforms oximes, including alkyl oximes, into a variety of pyrrolines in moderate to good yields. A radical clock experiment
The disclosed peptidomimetic macrocycles modulate the activity of MCL-1. Myeloid cell leukemia 1 (MCL-1) is a protein that inhibits cell death. Peptidomimetic macrocycles, pharmaceutical compositions, and methods disclosed herein can be used for the treatment of disease in which MCL-1 is over-expressed, such as cancer. In particular, MCL-1-modulating peptidomimetic macrocycles disclosed herein can be applied in the setting of resistance to BCL-2 family inhibitors, which is often engendered by MCL-1 over-expression or hyper-activation.
The present invention provides peptidomimetic macrocycles capable of modulating growth hormone levels and methods of using such macrocycles for the treatment of disease.