High yield synthesis of 4<i>H</i>-1,4-benzothiazine-1,1-dioxide derivatives
作者:Stefania De Montis、Claudia Fattuoni、Enzo Cadoni、Maria G. Cabiddu、Michele Usai、Salvatore Cabiddu
DOI:10.1002/jhet.5570450530
日期:2008.9
4H-1,4-Benzothiazine-1,1-dioxidederivatives were synthesized through a sequence of almost quantitative reactions. The commercial starting material 2-(methylsulfanyl)aniline was Boc-protected, N-acylated and oxidized at the sulfur atom to obtain a sulfonyl derivative. An anionic transposition of the acyl group followed by asimultaneous deprotection-cyclization gave the title products in excellent yields
通过一系列几乎定量的反应合成了4 H -1,4-苯并噻嗪-1,1-二氧化物衍生物。将商品原料2-(甲基硫烷基)苯胺进行Boc保护,N-酰化并在硫原子上氧化以获得磺酰基衍生物。酰基的阴离子转座,然后同时进行脱保护-环化,可以以优异的收率得到标题产物。所有产品和中间体均经过充分表征。
Directed ortho lithiation of phenylcarbamic acid 1,1-dimethylethyl ester (N-BOC-aniline). Revision and improvements
Evaluation of the results of a study, undertaken to examine the influence of the main reaction parameters (lithiation temperature, concentration, lithiating agent, and solvent) on the course of the title reaction, subsequently led to the development of an improved and more generally-applicable lithiation procedure. Hitherto unpublished stability data for solutions of t-BuLi and n-BuLi/TMEDA in diethyl ether and THF are reported for various temperatures.
PHENOTHIAZINE ANALOGUES AS MITOCHONDRIAL THERAPEUTIC AGENTS
申请人:Arizona Board of Regents on behalf of
Arizona State University