G. W. Kabalka, M.-L. Yao / Tetrahedron Letters 44 (2003) 1879–1881
1881
Acknowledgements
8. (a) Rammeloo, T.; Stevens, C.; De Kimpe, N. J. Org.
Chem. 2002, 67, 6509; (b) Rammeloo, T.; Stevens, C.
Chem. Commun. 2002, 250.
1
The authors wish to thank the US Department of
Energy and the Robert H. Cole Foundation for support
of this research.
9. Spectrum of acetal 6b: H NMR (250 MHz, CDCl3 with
TMS as internal standard): 3.93–4.05 (m, 2H); 3.63 (d,
J=6.18 Hz, 2H); 3.45 (dd, J=12.4 Hz and 6.7 Hz, 1H);
3.68 (s, 1H); 2.23–2.47 (m, 3H); 2.00–2.17 (m, 2H);
1.16–1.64 (m, 6H); 0.91 (t, J=6.48 Hz, 3H). 13C NMR:
106.7, 106.5, 75.9, 75.7, 69.0, 68.8, 66.7, 66.6, 38.6, 38.5,
38.3, 33.3, 33.1, 27.8, 26.8, 26.6, 22.6, 13.9. Anal. calcd
for C11H20O3: C, 65.97; H, 10.07. Found: C, 65.44; H.
10.09. HRMS; calcd for M+1 201.1491. Found: 201.1490.
10. Kocienski, P. J.; Cernigliaro, G.; Feldstein, G. J. Org.
Chem. 1997, 42, 353.
11. Kimura, Y.; Regen, S. L. J. Org. Chem. 1982, 47, 2493.
12. Spectrum of 3-methylenecyclobutanone acetal 9: 1H
NMR (250 MHz, CDCl3 with TMS as internal standard):
4.94–4.98 (m, 2H); 3.98–4.06 (m, 2H); 3.47–3.52 (m, 1H);
3.03–3.04 (m, 2H); 2.95–2.97 (m, 2H); 1.12–1.61 (m, 6H);
0.91 (t, J=6.33 Hz, 3H). 13C NMR: 138.5; 107.9, 105.7,
76.2, 69.2, 45.7, 45.5, 33.1, 27.2, 22.6, 14.0. Anal. calcd
for C11H18O2: C, 72.49; H, 9.95. Found: C, 72.60; H,
9.78.
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