radical, 2) cleavage of the formyl C‒H bond of the aldehyde substrates by a thiyl radical acting as a hydrogen atom transfer catalyst to generate acyl radicals, 3) Minisci-type addition of the resulting acyl radicals to N-heteroaromatics, and 4) a spin-center shift, photoredox-catalyzed single-electron reduction, and protonation to produce secondaryalcohol products. This metal-free hybrid catalysis proceeded
promote the cleavage of stable C–H bonds, such as formyl, α-hydroxy, and benzylic C–H bonds, through a hydrogen atom transfer (HAT) process without the use of exogenous photosensitizers. An electronically tuned thiophosphoric acid, 7,7’-OMe-TPA, was assembled with substrate or co-catalyst N-heteroaromatics through hydrogen bonding and π–π interactions to form electron donor–acceptor (EDA) complexes. Photoirradiation
我们开发了有机催化剂系统,通过氢原子转移 (HAT) 过程促进稳定的 C-H 键断裂,例如甲酰基、α-羟基和苄基 C-H 键,而无需使用外源光敏剂。电子调谐的硫代磷酸 7,7'-OMe-TPA通过氢键和 π-π 相互作用与底物或助催化剂N-杂芳烃组装,形成电子供体 - 受体 (EDA) 复合物。EDA 复合物的光辐照诱导逐步、连续的单电子转移 (SET) 过程以产生 HAT 活性硫自由基。第一个 SET 是从 7,7'-OMe-TPA 的富电子萘基到质子化的N-杂芳烃和从 7,7'-OMe-TPA 的硫代磷酸部分到所得萘基自由基阳离子的第二个质子偶联 SET (PCET)。光谱研究和理论计算表征了由短寿命中间体介导的逐步 SET 过程。该有机催化 HAT 系统应用于四种不同的碳氢 (C-H) 官能化反应、N-杂芳烃的羟烷基化和烷基化、醇的无受体脱氢和亚胺的苄基化,具有高官能团耐受性。
Fungal cell wall synthesis gene
申请人:——
公开号:US20040038239A1
公开(公告)日:2004-02-26
A reporter system reflecting the transport process that transports GPI-anchored proteins to the cell wall was constructed and compounds inhibiting this process were discovered. Further, genes conferring resistance to the above compounds were identified and methods of screening for compounds that inhibit the activity of the proteins encoded by these genes were developed.
Therefore, through the novel compounds, the present invention showed that antifungal agents having a novel mechanism, i.e. inhibiting the process that transports GPI-anchored proteins to the cell wall, could be achieved.
A reporter system reflecting the transport process that transports GPI-anchored proteins to the cell wall was constructed and compounds inhibiting this process were discovered. Further, genes conferring resistance to the above compounds were identified and methods of screening for compounds that inhibit the activity of the proteins encoded by these genes were developed. Therefore, through the novel compounds, the present invention showed that antifungal agents having a novel mechanism, i.e. inhibiting the process that transports GPI-anchored proteins to the cell wall, could be achieved.