Tetrahedron: Asymmetry 2003, 14, 2865. 28. Paju, A.; Kanger, T.; Pehk, T.; Lindmaa, R.; Müürisepp, A.; Lopp, M. Tetrahedron: Asymmetry 2003, 14, 1565. 29. Jõgi, A.; Paju, A.; Pehk, T.; Kailas, T.; Müürisepp, A.; Kanger, T.; Lopp, M. Synthesis 2006, 2006, 3031. 30. Paju, A.; Laos, M.; Jõgi, A.; Päri, M.; Jäälaid, R.; Pehk, T.; Kanger, T.; Lopp, M. Tetrahedron Lett. 2006, 47, 4491. 31. Paju, A.; Kanger, T.; Pehk, T.; Eek, M.; Lopp, M. Tetrahedron 2004, 60, 9081. 32. Jõgi, A.; Ilves, M.; Paju, A.; Kailas, T.; Müürisepp, A.; Lopp, M. Tetrahedron: Asymmetry 2008, 19, 628. 33. Jõgi, A.; Paju, A.; Pehk, T.; Kailas, T.; Müürisepp, A.; Lopp, M. Tetrahedron 2009, 65, 2959. 34. Verma, P.; Singh, S.; Dikshit, D. K.; Ray, S. Synthesis 1988, 1988, 68. 35. Ravid, U.; Silverstein, R. M.; Smith, L. R. Tetrahedron 1978, 34, 1449. 36. Pettit, G. R.; Kasturi, T. R. J. Org. Chem. 1961, 26, 4557. 37. Kraus, G. A.; Frazier, K. A.; Roth, B. D.; Neuenschwander, K. J. Org. Chem. 1981, 46, 2417. 38. Mao, Z.; Gregg, B. T.; Cutler, A. R. J. Am. Chem. Soc. 1995, 117, 10139. 39. Hansen, M. C.; Verdaguer, X.; Buchwald, S. L. J. Org. Chem. 1998, 63, 2360. 40. Yato, M.; Homma, K.; Ishida, A. Tetrahedron 2001, 57, 5353. 41. Matsubara, K.; Iura, T.; Maki, T.; Nagashima, H. J. Org. Chem. 2002, 67, 4985. 42. Paju, A.; Kanger, T.; Niitsoo, O.; Pehk, T.; Müürisepp, A.; Lopp, M. Tetrahedron: Asymmetry 2003, 14, 2393. 43. The number of lactol carbons in the range of 94 to 110 ppm exceeds that of possible when only spirocyclic acetals 9 are counted (12 vs 8), thus indicating a presence of other lactols. Most probably accountable for lactolalcohols 10 and 11 as depicted on the scheme 5. Also the number of quaternary and oxygen-linked carbons support the hypothesis of presence of overreduction products in the crude product. 44. Paquette, L. A.; Seekamp, C. K.; Kahane, A. L. J. Org. Chem. 2003, 68, 8614. 45. Chandrasekhar, S.; Tiwari, B.; Prakash, S. J. Arkivoc 2006, 2006, 155. 46. Brueckner, C.; Holzinger, H.; Reissig, H. U. J. Org. Chem. 1988, 53, 2450. 47. According to Kraus’ work (see ref 37) the TBDMS group should be stable under the reaction conditions described.
