The catalyticC(sp3)-H functionalization is highly desirable yet challenging in organic synthesis. Incorporation of the SP(O)(OR)2 group through C(sp3)-H functionalization remains unexplored. We herein report an unprecedented protocol for phosphorothiolation of primary and secondary C(sp3)-H via a multicomponent reaction with N-fluoro-substituted amides, elemental sulfur, and P(O)H compounds involving
Ammonia-borane as a Catalyst for the Direct Amidation of Carboxylic Acids
作者:P. Veeraraghavan Ramachandran、Henry J. Hamann
DOI:10.1021/acs.orglett.1c00591
日期:2021.4.16
Ammonia-borane serves as an efficient substoichiometric (10%) precatalyst for the direct amidation of both aromatic and aliphatic carboxylicacids. In situ generation of amine-boranes precedes the amidation and, unlike the amidation with stoichiometric amine-boranes, this process is facile with 1 equiv of the acid. This methodology has high functional group tolerance and chromatography-free purification
Copper-Catalyzed N-Directed Distal C(sp<sup>3</sup>)–H Sulfonylation and Thiolation with Sulfinate Salts
作者:Guang-Le Chen、Shi-Hui He、Liang Cheng、Feng Liu
DOI:10.1021/acs.orglett.1c03075
日期:2021.11.5
herein report a selective and catalytic C(sp3)–H functionalization approach to access amines bearing organo-sulfonyl and organo-thiol groups. This reaction proceeds through a cascade process of N-radical formation, alkyl radical formation via 1,5-HAT, and C–S bond formation, thereby offering a series of functionalized amines. This method could enable primary, secondary, and tertiary C(sp3)–H sulfonylation
A case study of Pd⋯Pd intramolecular interaction in a benzothiazole based palladacycle; catalytic activity toward amide synthesis <i>via</i> an isocyanide insertion pathway
An acetate bridge benzothiazolepalladacycle containing a rare metallophilic intramolecular Pd⋯Pd interaction was synthesized and thoroughly characterized. The synthesized benzothiazolepalladacycle directly anchored on SBA-15 to form an efficient heterogeneous catalyst for amide synthesis via the migratory isocyanide insertion pathway.
AMINE-BORANES AS BIFUNCTIONAL REAGENTS FOR DIRECT AMIDATION OF CARBOXYLIC ACIDS
申请人:Purdue Research Foundation
公开号:US20220055983A1
公开(公告)日:2022-02-24
The present invention generally relates to a process for selective and direct activation and subsequent amidation of aliphatic and aromatic carboxylic acids to afford an amide R
3
CONR
1
R
2
. That the process is capable of delivering gaseous or low-boiling point amines provides a major advantage over existing methodologies, which involves an intermediate of triacyloxyborane-amine complex [(R
3
CO
2
)
3
—B—NHR
1
R
2
]. This procedure readily produces primary, secondary, and tertiary amides, and is compatible with the chirality of the acid and amine involved. The preparation of known pharmaceutical molecules and intermediates has also been demonstrated.