SCHEDULED MAINTENANCE
4H-1,3-Oxazines (3) and/or 4,5-dihydro-oxazoles (9,10) and thia analogues are formed on reaction of alk-1-ynes with the 4,4-bis(trifluoromethyl)-1-oxa-3-azabuta-1,3-dienes (1) and 1-thia-3-azabuta-1,3-dienes (4), respectively.
K. Burger, E. Huber, W. Schöntag and R. Ottlinger, J. Chem. Soc., Chem. Commun., 1983, 945 DOI: 10.1039/C39830000945
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