1
|
Sen A, Kumar R, Tewari T, Gonnade RG, Chikkali SH. Iron-Catalyzed Alkoxylation, Dehydrogenative-Polymerization and Tandem Hydrosilylative-Alkoxylation. Chemistry 2023; 29:e202301375. [PMID: 37285327 DOI: 10.1002/chem.202301375] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2023] [Revised: 06/06/2023] [Accepted: 06/07/2023] [Indexed: 06/09/2023]
Abstract
Alkoxylation, hydrosilylative-alkoxylation, and dehydrogenative-polymerization are some of the most widely used transformations in synthetic chemistry. However, these transformations are traditionally catalyzed by precious, and rare late-transition metals. Presented here is a molecularly defined iron complex that catalyzes alkoxylation, tandem hydrosilylative-alkoxylation, and dehydrogenative polymerization of silanes under mild conditions. The iron complex [Fe(CO)4 (H)(SiPh3 )] 1 catalyzes a direct Si-O coupling reaction between an array of silanes and alcohols to produce desired alkoxysilanes in excellent yield, with H2 as the only byproduct. The iron catalyst tolerates various functional groups and provides access to 20 alkoxysilanes, including essential molecules such as β-citronellol and cholesterol. Further, complex 1 catalyzes the polymerization of renewable diol and silane monomer to produce a renewable and degradable poly(isosorbide-silyl ether). Remarkably, complex 1 catalyzes a tandem hydrosilylative-alkoxylation of alkynes under mild conditions to yield unsaturated silyl ethers. The synthetic utility has been demonstrated by gram-scale alkoxylation and hydrosilylative-alkoxylation reactions.
Collapse
Affiliation(s)
- Anirban Sen
- Polymer Science and Engineering Division, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pune, 411008, MH, India
- Academy of Scientific and Innovative Research (AcSIR) Sector 19, Kamla Nehru Nagar, Ghaziabad, 201002, U. P., India
| | - Rohit Kumar
- Polymer Science and Engineering Division, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pune, 411008, MH, India
- Academy of Scientific and Innovative Research (AcSIR) Sector 19, Kamla Nehru Nagar, Ghaziabad, 201002, U. P., India
| | - Tanuja Tewari
- Polymer Science and Engineering Division, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pune, 411008, MH, India
- Academy of Scientific and Innovative Research (AcSIR) Sector 19, Kamla Nehru Nagar, Ghaziabad, 201002, U. P., India
| | - Rajesh G Gonnade
- Academy of Scientific and Innovative Research (AcSIR) Sector 19, Kamla Nehru Nagar, Ghaziabad, 201002, U. P., India
- Center for Materials Characterization, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pune, 411008, MH, India
| | - Samir H Chikkali
- Polymer Science and Engineering Division, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pune, 411008, MH, India
- Academy of Scientific and Innovative Research (AcSIR) Sector 19, Kamla Nehru Nagar, Ghaziabad, 201002, U. P., India
| |
Collapse
|
2
|
Zhou M, Wang T, Cheng GJ. Mechanistic insights into reductive deamination with hydrosilanes catalyzed by B(C6F5)3: A DFT study. Front Chem 2022; 10:1025135. [DOI: 10.3389/fchem.2022.1025135] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2022] [Accepted: 09/20/2022] [Indexed: 11/18/2022] Open
Abstract
Selective defunctionalization of synthetic intermediates is a valuable approach in organic synthesis. Here, we present a theoretical study on the recently developed B(C6F5)3/hydrosilane-mediated reductive deamination reaction of primary amines. Our computational results provide important insights into the reaction mechanism, including the active intermediate, the competing reactions of the active intermediate, the role of excess hydrosilane, and the origin of chemoselectivity. Moreover, the study on the substituent effect of hydrosilane indicated a potential way to improve the efficiency of the reductive deamination reaction.
Collapse
|
3
|
Abstract
In the last two decades, boron-based catalysis has been gaining increasing traction in the field of organic synthesis. The use of halogenated triarylboranes as main group Lewis acid catalysts is an attractive strategy. It has been applied in a growing number of transformations over the years, where they may perform comparably or even better than the gold standard catalysts. This review discusses methods of borane synthesis and cutting-edge boron-based Lewis acid catalysis, focusing especially on tris(pentafluorophenyl)-borane [B(C6F5)3], and other halogenated triarylboranes, highlighting how boron Lewis acids employed as catalysts can unlock a plethora of unprecedented chemical transformations or improve the efficiency of existing reactions.
Collapse
|