( S )-2-硝基-6-取代的6,7-二氢-5 H-咪唑并[2,1- b ][1,3]恶嗪类化合物由于其优异的性能而被广泛探索作为新型抗结核药物的潜在用途。结核分枝杆菌需氧全细胞的杀菌特性. 有氧活性需要咪唑环 2-位上的氧原子。在这里,我们表明用氮或硫取代这种氧会产生等效的类似物。酰化氨基系列、氧化硫醚或用碳取代醚氧显着降低了化合物的效力。用氮替换 6 位的苄氧稍微提高了效力,并促进了对更易溶的 6-氨基系列中 SAR 的探索。通过在 6-( S ) 位置和末端疏水性芳族取代基之间扩展接头区域,实现了效力的显着改进。一个简单的四特征 QSAR 模型被推导出来合理化这一系列双环硝基咪唑的 MIC 结果。
Chemo-selective cross reaction of two enals <i>via</i> carbene-catalyzed dual activation
作者:Xiaolin Peng、Jun Xu、Tingting Li、Yonggui Robin Chi、Zhichao Jin
DOI:10.1039/d0sc03297b
日期:——
play important roles in substrate activation and enantioselectivity control. Many of the possible side reactions are not observed. Our reaction provides highly chemo- and diastereo-selective access to chiral lactones containing functionalizable 1,3-enyn units with excellent enantioselectivities (95 to >99% ee).
palladium‐catalyzed selective aminomethylation of conjugated 1,3‐dienes with aminals via double C—N bond activation is described. This simple method provides an effective and rapid approach for the synthesis of linear α,β‐unsaturated allylic amines with perfect regioselectivity. Mechanistic studies disclosed that one palladium catalyst cleaved two distinct C—N bond to furnish a cascade double C—N bond activation
The present invention provides a 2,3-dihydro-6-nitroimidazo[2,1-b]oxazole compound represented by the following general formula:
wherein R
1
represents a hydrogen atom or C1-C6 alkyl group, n represents an integer of 0 to 6, R
2
represents a group —OR
3
or the like, and R
3
represents a hydrogen atom, C1-C6 alkyl group or the like, or R
1
and —(CH
2
)
n
R
2
may bind to each other together with carbon atoms adjacent thereto through nitrogen atoms so as to form a spiro ring represented by the general formula (H):
wherein R
41
is hydrogen, C1-C6 alkyl group or the like. The present compound has an excellent bactericidal action against
Mycobacterium tuberculosis
, multi-drug-resistant
Mycobacterium tuberculosis
, and atypical acid-fast bacteria.
The present invention provides a 2,3-dihydro-6-nitroimidazo[2,1-b]oxazole compound represented by the following general formula:
wherein R1 represents a hydrogen atom or C1-C6 alkyl group, n represents an integer of 0 to 6, R2 represents a group —OR3 or the like, and R3 represents a hydrogen atom, C1-C6 alkyl group or the like, or R1 and —(CH2)nR2 may bind to each other together with carbon atoms adjacent thereto through nitrogen atoms so as to form a spiro ring represented by the general formula (H):
wherein R41 is hydrogen, C1-C6 alkyl group or the like. The present compound has an excellent bactericidal action against Mycobacterium tuberculosis, multi-drug-resistant Mycobacterium tuberculosis, and atypical acid-fast bacteria.