,S)-1,1-BIS-ETHOXYCARBONYL-2,2-BIS-P-TOLYLSULFINYL ETHENE - A HIGHLY STEREOSELECTIVE BUT UNEXPECTEDLY UNREACTIVE DIENOPHILE IN ASYMMETRIC DIELS-ALDER REACTIONS
Jc. Carretero et al., ,S)-1,1-BIS-ETHOXYCARBONYL-2,2-BIS-P-TOLYLSULFINYL ETHENE - A HIGHLY STEREOSELECTIVE BUT UNEXPECTEDLY UNREACTIVE DIENOPHILE IN ASYMMETRIC DIELS-ALDER REACTIONS, Tetrahedron : asymmetry, 8(3), 1997, pp. 409-416
The synthesis and dienophilic behaviour of ,S)-1,1-bis-ethoxycarbonyl-
2,2-bis-p-tolylsulfinyl ethene with cyclic and acyclic dienes is repor
ted. The stereoselectivity is high with cyclopentadiene and complete w
ith acyclic dienes, but its reactivity is unexpectedly low, requiring
high pressures (13 Kbar) to evolve into the corresponding adducts or t
heir pyrolytic sulfinyl elimination products. (C) 1997 Elsevier Scienc
e Ltd. All rights reserved.