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- For the preparation of precursor 16, see: Pavan, M. P.; Kumara Swamy, K. C. Synlett. 2011, 1288-1292.
- For the preparation of precursor 20, see: Kotikalapudi, R. “Gold catalyzed cyclizations of alkynols/ propargylic esters and Allenylphosphonates/ allenylphosphine oxides in cycloaddition/ cyclization reactions” PhD thesis, 2013, University of Hyderabad: India.
- Experimental data for the new compounds reported here are available with the authors. X-ray data for compounds 6 [CCDC: 1481065], 13·CHCl3.1/2H2O [CCDC: 1481066], 15 [CCDC: 1481067] and 21·1/2 H3CC(O)OC2H5 [CCDC: 1481068] as supplemental material were collected at 293 K on a Bruker AXS-SMART or on an OXFORD diffractometer using Mo-Kα radiation (λ = 0.71073 Å) using standard methods. 13 Copies of the information may be obtained free of charge from The Director, CCDC, 12 Union Road, Cambridge CB2 1 EZ, UK (Fax: + 44-1223-336033; e-mail: [email protected] or www.ccdc.can.ac.uk)
- Structure solution and refinement: Sheldrick, G. M. SADABS, Siemens Area Detector Absorption Correction, University of Göttingen: Germany, 1996. (b) Sheldrick, G. M., SHELX-97- A program for crystal structure solution and refinement, University of Göttingen, 1997. (c) Sheldrick, G. M. SHELXTL NT Crystal Structure Analysis Package, Bruker AXS, Analytical X-ray System: WI, USA, 1999, version 5.10.