A facile synthesis of pyrrolo-(di)-benzazocinones via an intramolecular N-acyliminium ion cyclisation
作者:Frank D. King、Abil E. Aliev、Stephen Caddick、Derek A. Tocher、Denis Courtier-Murias
DOI:10.1039/b815195d
日期:——
A facile, moderate to high yielding synthesis of hexahydro-(di)-benzazocinones is described via an intramolecular N-acyliminium ion cyclisation. The iminium ion intermediates are formed from the readily available 4,4-diethoxybutyl amides with an excess of triflic acid. For electron-withdrawing substituents, better yields were obtained from the pre-formed 2-hydroxypyrrolidine amides. From NMR studies
A new class of chiralruthenium catalysts is introduced in which ruthenium is cyclometalated by two 7-methyl-1,7-phenanthrolinium heterocycles, resulting in chelating pyridylidene remote N-heterocycliccarbene ligands (rNHCs). The overall chirality results from a stereogenic metal center featuring either a Λ or Δ absolute configuration. This work features the importance of the relative metal-centered
Here we describe an asymmetric [3,3]-sigmatropicrearrangement of aryl iodanes that enables the enantioselective α-arylation of chiral 2-oxazolines, thereby producing valuable, chiral α-aryl carbonyl compounds. The success of this protocol hinges on the selective assembly of aryl iodanes with 2-oxazolines and the smooth deprotonation of the in situ generated iodonium-imine species. The nearly neutral
Structure-Based Design of Macrocyclic Coagulation Factor VIIa Inhibitors
作者:E. Scott Priestley、Daniel L. Cheney、Indawati DeLucca、Anzhi Wei、Joseph M. Luettgen、Alan R. Rendina、Pancras C. Wong、Ruth R. Wexler
DOI:10.1021/acs.jmedchem.5b00788
日期:2015.8.13
On the basis of a crystal structure of a phenylpyrrolidine lead and subsequent molecular modeling results, we designed and synthesized a novel series of macrocyclic FVIIa inhibitors. The optimal 16-membered macrocycle was 60-fold more potent than an acyclic analog. Further potency optimization by incorporation of P1′ alkyl sulfone and P2 methyl groups provided a macrocycle with TF/FVIIa Ki = 1.6 nM
基于苯基吡咯烷铅的晶体结构和随后的分子建模结果,我们设计和合成了一系列新的大环FVIIa抑制剂。最佳的16元大环比无环类似物的效价高60倍。通过结合P1'烷基砜和P2甲基进行的进一步效能优化提供了一个大环,其TF / FVIIa K i = 1.6 nM,对一组7种丝氨酸蛋白酶的优异选择性,以及FVII缺乏的凝血酶原时间EC 2 x = 1.2μM。这种有效的,选择性的大环骨架的发现为开发口服生物利用的FVIIa抑制剂开辟了新的可能性。
Selective α-Oxyamination and Hydroxylation of Aliphatic Amides
α‐modification of amides is still a challenge because of the low acidity of α‐CH groups. The α‐functionalization of N−H (primary and secondary) amides, containing both an unactived α‐C−H bond and a competitively active N−H bond, remains elusive. Shown herein is the general and efficient oxidative α‐oxyamination and hydroxylation of aliphaticamides including secondary N−H amides. This transition‐metal‐free