Structurally dependent behavior of the nitromethyl group of aliphatic γ-nitrothioamides under nitrile oxide generation reaction conditions
摘要:
Treatment of (3-allyl)-4-nitromethylthiolactams with phenyl isocyanate and triethylamine has been found to lead to (3-allyl)-4-isothiocyanatolactams. In the case of 3-unsubstituted 4-nitromethylthiolactams, the retro-Michael addition reaction of the nitromethyl group, affording alpha,beta-unsaturated thiolactams and 4-nitromethyllactams, is also observed. Under the same reaction conditions acyclic (alpha-allyl)-gamma-nitrothioamides have been unexpectedly found to lead to alpha,beta-unsaturated nitriles. Mechanisms for these reactions are proposed. (C) 2002 Elsevier Science Ltd. All rights reserved.
Structurally dependent behavior of the nitromethyl group of aliphatic γ-nitrothioamides under nitrile oxide generation reaction conditions
摘要:
Treatment of (3-allyl)-4-nitromethylthiolactams with phenyl isocyanate and triethylamine has been found to lead to (3-allyl)-4-isothiocyanatolactams. In the case of 3-unsubstituted 4-nitromethylthiolactams, the retro-Michael addition reaction of the nitromethyl group, affording alpha,beta-unsaturated thiolactams and 4-nitromethyllactams, is also observed. Under the same reaction conditions acyclic (alpha-allyl)-gamma-nitrothioamides have been unexpectedly found to lead to alpha,beta-unsaturated nitriles. Mechanisms for these reactions are proposed. (C) 2002 Elsevier Science Ltd. All rights reserved.