Photoassisted Synthesis of Enantiopure Alkaloid Mimics Possessing Unprecedented Polyheterocyclic Cores
作者:N.N. Bhuvan Kumar、Olga A. Mukhina、Andrei G. Kutateladze
DOI:10.1021/ja4042109
日期:2013.7.3
high yielding intramolecularcycloadditions of photogeneratedazaxylylenes tethered to pyrroles, with further growth of molecular complexity via post-photochemical transformations of primary photoproducts. This expeditious access to structurally unprecedented polyheterocyclic cores is being developed in the context of diversity-oriented synthesis, as the modular design allows for rapid "pre-assembly"
New arylsulfonohydrazide inhibitors of enzymes MurC and MurD
申请人:UNIVERZA V LJUBLJANI, FAKULTETA ZA FARMACIJO
公开号:EP1845083A3
公开(公告)日:2009-12-30
This invention belongs to the field of pharmaceutical chemistry and relates to new arylsulfonohydrazides as inhibitors of UDP-N-acetylmuramyl:L-alanine ligaze (MurC) and UDP-N-acetylmuramyl-L-alanine:D-glutamate ligaze (MurD), to procedures for their preparation and pharmaceutical preparations containing the same. The enzymes MurC and MurD are the key enzymes involved in the synthesis of bacterial peptidoglycan, so arylsulfonohydrazide inhibitors possess antibacterial activity. Compounds of general formula I
and the pharmaceutically acceptable salts are described. The appropriate substituents are clearly presented in the body of the text and in claims.
A six-step asymmetric total synthesis of (20S)-camptothecin (1) has been accomplished in 25% overall yield starting from the known pyridone 3. The key steps in this synthesis are the chemoselective Ni-catalyzed hydrogenation of 3-cyanopyridone 6 to 3-formylpyridone 7 in AcOH/pyridine/H2O and the Davis asymmetric hydroxylation of tricyclic lactone 4 utilizing a chiral N-sulfonyloxaziridine into (4′S)-tricyclic
(20 S)-喜树碱(1)的六步不对称总合成从已知的吡啶酮3开始以25%的总收率完成。该合成过程中的关键步骤是在AcOH /吡啶/ H 2 O中将3-氰基吡啶酮6选择性化学催化Ni氢化成3-甲酰基吡啶酮7和利用手性N-磺酰基恶唑烷将三环内酯4的Davis不对称羟基化为(4' S)-三环羟基内酯2。
A series of novel N-benzylidenesulfonohydrazide compounds were designedand synthesized as inhibitors of UDP-N-acetylmuramic acid:L-alanine ligase (MurC) andUDP-N-acetylmuramoyl-L-alanine:D-glutamate ligase (MurD) from E. coli, involved inthe biosynthesis of bacterial cell-walls. Some compounds possessed inhibitory activityagainst both enzymes with IC50 values as low as 30 μM. In addition, a new, one-potsynthesis of amidobenzaldehydes is reported.