Processes for preparing 6-alkyl-5-arylsulfonyl-dihydrophenanthridines
申请人:Ridgway Hugh Brian
公开号:US20060025436A1
公开(公告)日:2006-02-02
Synthetic methods are provided for production of compounds of the formula:
where R
1
, R
2
, R
3
, R4, R
5
, R
6
, R
7
, R
8
, R
9
, R
10
, R
11
, R
12
, R
13
and R
14
are as defined in the specification.
Synthesis of biaryls via intramolecular free radical ipso-substitution reactions
作者:Feroze Ujjainwalla、Maria Lucília E.N. da Mata、Andrew M.K. Pennell、Carmen Escolano、William B. Motherwell、Santiago Vázquez
DOI:10.1016/j.tet.2015.07.048
日期:2015.9
intramolecular freeradical [1,5]-ipso-substitution using sulfonamide and sulfonate derived tethering chains. The overall efficiency of the process is determined by appropriately positioned substituents on the aromatic acceptor ring. The extension of the process to benzylic sulfonates and their corresponding N-methylsulfonamide alternatives as substrates in potential [1,6]-ipso-substitution reactions leads
Deacetylative Aryl Migration of Diaryliodonium Salts with C(sp<sup>2</sup>)–N Bond Formation toward <i>ortho</i>-Iodo <i>N</i>-Aryl Sulfonamides
作者:Huangguan Chen、Limin Wang、Jianwei Han
DOI:10.1021/acs.orglett.0c01024
日期:2020.5.1
An unprecedented approach of metal-free C(sp2)-N bond formation via deacetylation/intramolecular aryl migration is demonstrated with novel N-sulfonamide substituted diaryliodonium salts. The reaction provides a variety of ortho-iodo N-aryl sulfonamides. The products were employed in several coupling reactions to afford useful diarylamine scaffolds. Furthermore, the key intermediates of zwitterionic
An Approach to Cyclohepta[<i>b</i>]indoles through an Allenamide (4 + 3) Cycloaddition–Grignard Cyclization–Chugaev Elimination Sequence
作者:Shuzhong He、Richard P. Hsung、William R. Presser、Zhi-Xiong Ma、Bryan J. Haugen
DOI:10.1021/ol5006455
日期:2014.4.18
A strategy for synthesizing highly functionalized cyclohepta[b]indoles through a concise (4 + 3) cycloaddition–cyclization–elimination sequence is described. The cycloaddition features nitrogen-stabilized oxyallylcations derived from epoxidations of N-aryl-N-sulfonyl-substituted allenamides, while the cyclization and elimination employed an intramolecular Grignard addition and a one-step Chugaev process
Enantioselective Synthesis of Biscyclopropanes Using Alkynes as Dicarbene Equivalents
作者:Chuntao Wang、Rui Wu、Kai Chen、Shifa Zhu
DOI:10.1002/anie.202305864
日期:2023.7.17
2–3 all-carbon quaternary centers were constructed with excellent stereoselectivity in one step. The method was extended to the cyclopropanation/cyclopropenation. In these processes, the functional alkyne is used as a dicarbene equivalent and 3 new rings are formed.
报道了手性Rh 2 (II) 催化的CF 2 H-取代的烯炔与烯烃的双环丙烷化反应。一步构建了具有4-5个邻位立体中心和2-3个全碳季中心的双环丙烷,具有良好的立体选择性。该方法扩展到环丙烷化/环丙烯化。在这些过程中,官能炔被用作二碳烯等价物,并形成 3 个新环。