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The stoichiometric reactions of enamines prepared from aldehydes and diphenyl‐prolinol silyl ethers (intermediates of numerous organocatalytic processes) with nitro olefins have been investigated. As reported in the last century for simple achiral and chiral enamines, the products are cyclobutanes (4 with monosubstituted nitro‐ethenes), dihydro‐oxazine N‐oxide derivatives (5 with disubstituted nitro‐ethenes),...
By combining enamines, derived from aldehydes and diphenylprolinol trimethylsilyl ether (the Hayashi catalyst), with nitroethenes ((D6)benzene, 4‐Å molecular sieves, room temperature) intermediates of the corresponding catalytic Michael‐addition cycles were formed and characterized (IR, NMR, X‐ray analysis; Schemes 3–6 and Fig. 1–3). Besides cyclobutanes 2, 1,2‐oxazine N‐oxide derivatives 3–6 and...
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