Tetrahedron Letters p. 4691 - 4694 (1991)
Update date:2022-08-05
Topics:
Schinzer, Dieter
Kalesse, Markus
Double Michael additions of vinylogous esters of type 1 with crotyl ester generates diastereoselectively bicyclo<2.2.2>octanone 2 with four defined chiral centers via a synclinal transition state.Thexyldimethylsilyl enol ethers of type 5 and 10 undergo smooth cyclization to bicyclo<3.3.1>nonenones 7 and bicyclo<3.3.0>octenones 12 by addition of Lewis acids.
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