已经开发了 2-异氰硫基苯甲醚向 2-甲硅烷基化苯并噻唑结构单元的去甲基化甲硅烷基级联环化。“自由基引发剂-抑制剂共生”系统的开发解决了由动力学不利的反应性甲硅烷基自由基物质产生带来的其他主要甲基自由基引发的副反应的挑战。本协议中访问的产品可修改为各种下游功能化反应,包括通过桧山交叉偶联反应快速构建拓扑异构酶 II 抑制剂,以及通过无氟/氢氧化物亲核取代酰氯来快速构建抗病毒剂。
已经开发了 2-异氰硫基苯甲醚向 2-甲硅烷基化苯并噻唑结构单元的去甲基化甲硅烷基级联环化。“自由基引发剂-抑制剂共生”系统的开发解决了由动力学不利的反应性甲硅烷基自由基物质产生带来的其他主要甲基自由基引发的副反应的挑战。本协议中访问的产品可修改为各种下游功能化反应,包括通过桧山交叉偶联反应快速构建拓扑异构酶 II 抑制剂,以及通过无氟/氢氧化物亲核取代酰氯来快速构建抗病毒剂。
Aluminum Bases for the Highly Chemoselective Preparation of Aryl and Heteroaryl Aluminum Compounds
作者:Stefan H. Wunderlich、Paul Knochel
DOI:10.1002/anie.200804966
日期:2009.2.9
Selective CH activation with a series of neutral aluminum trisamide bases led to a wide range of polyfunctional aryl and heteroarylaluminum reagents. Ester and cyano groups are stable under the reaction conditions for this direct alumination, and donor oxygen substituents are efficient directing groups. High metalation regioselectivities were observed with O,S and N,S heterocycles (see example).
Transsilylation reactions of benzothiazol-2-ylsilanes with chlorosilanes are sensitive to small variations in the ligands of both components. Exchange reactions of benzothiazol-2-yltrimethylsilane (Ia) with chlorogermanes yield di-, tri-, and tetra-benzothiazol-2-ylgermanes. Disproportionation reactions precede the transsilylation reactions of Ia with chlorosilanes containing SiH bond. The results