2
266
T. K. Maishal et al. / Tetrahedron Letters 43 (2002) 2263–2267
Scheme 3. Reagents and conditions: (a) H O, heat; (b) dibutyltin oxide, MeOH, rt; (c) allyl bromide, DCM, heat; (d) Ac O, Py,
2
2
DCM, rt; (e) allyl alcohol, K-10 clay, heat; (f) Ac O, Py, DCM, rt.
2
Scheme 4.
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