1
|
Ahmed A, Sakander N, Rasool F, Hussain N, Mukherjee D. Diastereoselective synthesis of glycopyrans 1,2-annulated with dioxazinanes from 1,2-anhydrosugars and N-substituted nitrones. Org Biomol Chem 2022; 20:1436-1443. [PMID: 35081611 DOI: 10.1039/d1ob02310a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
1,2-Annulated pyranose sugars fused with six membered rings have emerged as an important class of carbohydrates with wide biological and synthetic utility. We now describe zinc chloride catalyzed one pot diastereoselective synthesis of sugar fused dioxazinanes from 1,2-anhydro sugars and N-substituted aromatic nitrones. Various aromatic nitrones with different substituents undergo the reaction smoothly. The developed strategy works well with both ester and ether protection on the sugar and proceeds under mild reaction conditions. The mechanism seems to involve activation of the anhydrosugar by ZnCl2 for nucleophilic attack by the nitrone followed by cyclization.
Collapse
Affiliation(s)
- Ajaz Ahmed
- Natural Product and Medicinal Chemistry Division, Indian Institute of Integrative Medicine (IIIM), Jammu-180001, India. .,Academy of Scientific and Innovative Research (AcSIR-IIIM), Jammu-180001, India
| | - Norein Sakander
- Natural Product and Medicinal Chemistry Division, Indian Institute of Integrative Medicine (IIIM), Jammu-180001, India. .,Academy of Scientific and Innovative Research (AcSIR-IIIM), Jammu-180001, India
| | - Faheem Rasool
- Natural Product and Medicinal Chemistry Division, Indian Institute of Integrative Medicine (IIIM), Jammu-180001, India. .,Department of Chemistry, Govt. College for Women, Parade Ground, Jammu-180001, India.,Higher Education Department, Govt. of Jammu and Kashmir, India
| | - Nazar Hussain
- Natural Product and Medicinal Chemistry Division, Indian Institute of Integrative Medicine (IIIM), Jammu-180001, India. .,Department of Medicinal Chemistry, Faculty of Ayurveda, Instituteof Medical Sciences, Banaras Hindu University, Varanasi-221005, India
| | - Debaraj Mukherjee
- Natural Product and Medicinal Chemistry Division, Indian Institute of Integrative Medicine (IIIM), Jammu-180001, India. .,Academy of Scientific and Innovative Research (AcSIR-IIIM), Jammu-180001, India
| |
Collapse
|
2
|
Yang XC, Xu M, Wang JB, Liu MM, Mathey F, Hua YZ, Wang MC. Enantioselective synthesis of indanone spiro-isochromanone derivatives via a dinuclear zinc-catalyzed Michael/transesterification tandem reaction. Org Biomol Chem 2020; 18:3917-3926. [PMID: 32400845 DOI: 10.1039/d0ob00541j] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An enantioselective Michael/transesterification tandem reaction of α-hydroxy indanones with ortho-ester chalcones was realized using dinuclear zinc catalysts. A series of enantiomerically pure spiro[indanone-2,3'-isochromane-1-one] derivatives were obtained in good yields with excellent stereoselectivities (up to >20 : 1 dr, up to >99% ee). This protocol could be conducted on a gram scale without affecting its stereoselectivities. In addition, the absolute stereochemistry of the products was determined by X-ray crystallographic analysis of 3ac, and a positive nonlinear effect was observed. Finally, a possible catalytic cycle was proposed to explain the origin of the enantioselectivity.
Collapse
Affiliation(s)
- Xiao-Chao Yang
- College of Chemistry and Institute of Green catalysis, Zhengzhou University, No. 100, Science Road, Zhengzhou, Henan Province 450000, P. R. China.
| | - Meng Xu
- College of Chemistry and Institute of Green catalysis, Zhengzhou University, No. 100, Science Road, Zhengzhou, Henan Province 450000, P. R. China.
| | - Jin-Bao Wang
- College of Chemistry and Institute of Green catalysis, Zhengzhou University, No. 100, Science Road, Zhengzhou, Henan Province 450000, P. R. China.
| | - Meng-Meng Liu
- College of Chemistry and Institute of Green catalysis, Zhengzhou University, No. 100, Science Road, Zhengzhou, Henan Province 450000, P. R. China.
| | - François Mathey
- College of Chemistry and Institute of Green catalysis, Zhengzhou University, No. 100, Science Road, Zhengzhou, Henan Province 450000, P. R. China.
| | - Yuan-Zhao Hua
- College of Chemistry and Institute of Green catalysis, Zhengzhou University, No. 100, Science Road, Zhengzhou, Henan Province 450000, P. R. China.
| | - Min-Can Wang
- College of Chemistry and Institute of Green catalysis, Zhengzhou University, No. 100, Science Road, Zhengzhou, Henan Province 450000, P. R. China.
| |
Collapse
|
3
|
Parasuraman K, Chennaiah A, Dubbu S, Ibrahim Sheriff AK, Vankar YD. Stereoselective synthesis of substituted 1,2-annulated sugars by domino double-Michael addition reaction. Carbohydr Res 2019; 477:26-31. [PMID: 30954772 DOI: 10.1016/j.carres.2019.03.007] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2019] [Revised: 03/04/2019] [Accepted: 03/18/2019] [Indexed: 11/16/2022]
Abstract
A simple, highly stereoselective one-pot methodology for the synthesis of novel 1,2-annulated sugars comprising of oxa-oxa and oxa-carbasugar fused skeletons from 2-nitrogalactal and a sugar-derived enone, obtained from 2-formylgalactal, promoted by KOtBu and CH3ONa respectively is described. Both processes rely on a domino double-Michael addition reaction resulting in the formation of three stereocenters in a single pot, including a quaternary center.
Collapse
Affiliation(s)
- Kadigachalam Parasuraman
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur, 208016, India; PG and Research Department of Chemistry, C. Abdul Hakeem College (Autonomous), Melvisharam, 632509, Tamil Nadu, India
| | - Ande Chennaiah
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur, 208016, India
| | - Sateesh Dubbu
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur, 208016, India
| | - A K Ibrahim Sheriff
- PG and Research Department of Chemistry, C. Abdul Hakeem College (Autonomous), Melvisharam, 632509, Tamil Nadu, India
| | - Yashwant D Vankar
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur, 208016, India.
| |
Collapse
|
4
|
Verma AK, Chennaiah A, Dubbu S, Vankar YD. Palladium catalyzed synthesis of sugar-fused indolines via C(sp 2)-H/NH activation. Carbohydr Res 2019; 473:57-65. [PMID: 30639591 DOI: 10.1016/j.carres.2018.12.015] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2018] [Revised: 12/26/2018] [Accepted: 12/26/2018] [Indexed: 11/28/2022]
Abstract
A simple Pd(OAc)2 catalyzed strategy for the synthesis of sugar-fused indolines from 2-N-oxalylamido-2-deoxy-C-aryl glycosides is reported by utilizing N-oxalylamido group as an auxiliary via C(sp2)-H/NH Activation. The reaction is successfully applied on glucose as well as galactose derived differently substituted 2-N-oxalylamido-2-deoxy-C-aryl glycosides to give sugar-fused indolines in moderate to good yields. The utility of this strategy in the synthesis of sugar-fused indoles is also described.
Collapse
Affiliation(s)
- Ashish Kumar Verma
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur, 208016, India
| | - Ande Chennaiah
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur, 208016, India
| | - Sateesh Dubbu
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur, 208016, India
| | - Yashwant D Vankar
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur, 208016, India.
| |
Collapse
|