Rhodium generated carbonyl ylides with p -quinones: Synthesis of oxa-bridged polycyclic systems

Muthusamy, Sengodagounder ; Babu, Srinivasarao Arulananda ; Gunanathan, Chidambaram ; Suresh, Eringathodi ; Dastidar, Parthasarathi ; Jasra, Raksh Vir (2001) Rhodium generated carbonyl ylides with p -quinones: Synthesis of oxa-bridged polycyclic systems Tetrahedron, 57 (32). pp. 7009-7019. ISSN 0040-4020

Full text not available from this repository.

Official URL: https://www.sciencedirect.com/science/article/pii/...

Related URL: http://dx.doi.org/10.1016/S0040-4020(01)00657-3


A series of α-diazo carbonyl compounds tethered to substituted cyclopentanone and cyclohexanone units with different tether lengths have been synthesized using diazomethane solution or methanesulphonyl azide. The above synthesized α-diazo carbonyl compounds with rhodium(II) acetate dimer furnish cyclic five- or six-membered-ring carbonyl ylide dipoles, which undergo facile 1,3-dipolar cycloaddition with p-quinones to furnish various novel oxa-bridged polycyclic systems 10, 13 and 11, 14 as C═C and C═O addition products of p-quinones. Very interesting unusual cyclization product, tri-oxapolycyclic compounds 12 and 15 were also obtained. Single-crystal X-ray analyses of 11a, 12d and 14a are reported to firmly establish the structure and stereochemistry of the oxa-bridged polycyclic systems. The molecules 11a and 14a exhibit novel C–H⋯O hydrogen bonding motif in the crystal structure. On the other hand, the molecule 12d revealed both O–H⋯O and C–H⋯O motifs in the solid-state architecture.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Benzoquinone; Carbonyl Ylides; Dipolar Cycloaddition; Diazo Compounds; Naphthoquinones; Rhodium Acetate Catalyst
ID Code:112818
Deposited On:23 Apr 2018 06:33
Last Modified:23 Apr 2018 06:33

Repository Staff Only: item control page