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2005
Bridged compounds
Q 0060
Preparation of Complex Bridged Bicyclic Ring Systems from 3,3-Diacetoxy-2-phenylsulfonylpropene and β-Keto Esters. — Sulfone (II) undergoes Michael
26- 047 addition
with β-keto esters (I) or (XII) to give the corresponding keto sulfones. They
are converted to bicyclic bridged keto esters in good yields. The latter step gives better
results for pivalates, which are generated prior to the cyclization, than for acetates (III).
— (KRAUS*, G. A.; JEON, I.; Tetrahedron 61 (2005) 8, 2111-2116; Dep. Chem.,
Iowa State Univ., Ames, IA 50011, USA; Eng.) — Klein
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