Mechanistic Dichotomy with Alkynes in the Formal Hydrohydrazination/Fischer Indolization Tandem Reaction Catalyzed by a Ph3PAuNTf2/pTSA Binary System
作者:Nitin T. Patil、Ashok Konala
DOI:10.1002/ejoc.201001114
日期:2010.12
method involving a formalhydrohydrazination/ Fischerindolizationtandemreaction to synthesize 2,3-disubstituted indoles from alkynes and arylhydrazines has been developed. The approach uses a Ph 3 PAuNTf 2 /pTSA·H 2O binary catalytic system in which a very low catalyst loading of Ph 3 PAuNTf 2 (2 mol-%) is required. The reaction time is very short and, most importantly, the reaction is not sensitive
Nitrogen revives: Cyclic N‐acyliminium ions were generated from α,β‐unsaturated γ‐lactams (1) and underwent intermolecular addition by indole nucleophiles (2) under the catalysis of a chiral Brønsted acid (3). A variety of N‐functionalizedindole derivatives containing a pyrrolidinone moiety (4) were assembled with high enantioselectivity. Bn=benzyl.
Pd(0)-Catalyzed Dearomative Diarylation of Indoles
作者:David A. Petrone、Masaru Kondo、Nicolas Zeidan、Mark Lautens
DOI:10.1002/chem.201600118
日期:2016.4.11
We have developed a protocol for a Pd(0)‐catalyzed dearomative syn 1,2‐diarylation of indoles using readily available boroxines (dehydrated boronic acids) as coupling partners. This reaction proceeds efficiently using PtBu3 as the ligand to divergently access to fused indolines while minimizing the extent of direct Suzukicoupling. The scope of the reaction is remarkably broad and all products are
我们已经开发出了一种使用容易获得的硼氧烷(脱水硼酸)作为偶联伙伴,对吲哚进行Pd(0)催化的脱芳香基syn 1,2-二芳基化的方案。该反应使用P t Bu 3作为配体有效地进行,以发散地接近稠合的二氢吲哚,同时最小化直接铃木偶联的程度。反应的范围非常广泛,所有产物均以单一非对映异构体的形式获得,产率中等至优异。我们还编辑了一些数据,这些数据使底物和环硼氧烷的空间和电子特性与直接Suzuki偶联过程中经历所需的脱芳香性过程的倾向相平行。
Process for preparation of fused pyrroles
申请人:——
公开号:US20040049054A1
公开(公告)日:2004-03-11
The invention provides processes for the preparation of fused pyrroles, preferably indoles, which permit the use of inexpensive aromatic amines themselves as the raw material and attain high atomic efficiency and high regioselectivity. Specifically, a process for the preparation of fused pyrroles, e.g., indoles bearing methyl at the 3-position of pyrrole ring and R
1
(or R
2
) of the general formula (4) at the 2-position thereof, or 3,3-disubstituted indoles bearing R
1
and R
2
at the 3-position of pyrrole ring and methyl at the 2-position thereof, characterized by reacting an alkynol of the general formula (4) with an aromatic primary amine in the presence of a ruthenium complex, more preferably with an acid or an ammonium salt thereof being made to coexist.
1
[In the general formula (4), R
1
and R
2
are each independently hydrogen, optionally substituted alkyl, or optionally substituted aryl, or alternatively R
1
and R
2
may be united to form an alkylene chain.]
Novel cannabimimetic indole derivatives are presented which have preferentially high affinities for one of the cannabinoid CB1 or CB2 receptor sites. The improved receptor affinity makes these analogs therapeutically useful as medications in individual and animals for treatment of pain, glaucoma, epilepsy, nausea associated with chemotherapy.