Highly stereoselective synthesis of trans,trans-4-aryl-2,3-oxetanedimethanols: Preparation of oxetanocin a analogues
作者:Michael E. Jung、Christopher J. Nichols
DOI:10.1016/0040-4039(96)01720-0
日期:1996.10
A short (5-step) synthesis of the oxetanocin A analogues 12a and 12b has been accomplished, with very good stereoselectivity in the key iodocyclization step.
Catalytic asymmetric allylation of aldehydes with allylic trialkylstannanes was achieved with BINAP•AgOTf complex as catalyst. The chiral silver(I) catalyst was readily prepared by stirring an equimolar mixture of BINAP and silver(I) triflate in THF at room temperature. The allylation of a variety of aromatic and α,β-unsaturated aldehydes resulted in high yields and remarkable enantioselectivities
Tetracycline analogues with a selective inhibitory effect on HIF-1α
作者:Y. Bendiabdellah、K. M. Rahman、B. Uranchimeg、K. S. Nahar、D. Antonow、R. H. Shoemaker、G. Melillo、G. Zinzalla、D. E. Thurston
DOI:10.1039/c4md00111g
日期:——
As part of a programme to discover novel transcription factor inhibitors, a 40-membered library of tetracycline analogues was screened to identify potential HIF-1 inhibitors. Two novel analogues (5b and 5c) with significant HIF-1 modulation properties were identified. These molecules possess good cellular penetration properties, and provide significant down-regulation of VEGF in U251 cells.