2,3-Dihydro-4H-1,4-thiazines and 5,6-dihydro-3H-furo[3,4-b]-1,4-thiazines from 4-tetrahydropyranyloxyalk-2-ynenitriles.
摘要:
5-Cyano-6-(1-hydroxyalkyl)-4H-1,4-thiazines, derived from the corresponding 4-tetrahydropyranyloxyacetylenic nitriles, undergo base catalysed ring closure to give 3H-furo[3,4-b]-1,4-thiazines.
2,3-Dihydro-4H-1,4-thiazines and 5,6-dihydro-3H-furo[3,4-b]-1,4-thiazines from 4-tetrahydropyranyloxyalk-2-ynenitriles.
摘要:
5-Cyano-6-(1-hydroxyalkyl)-4H-1,4-thiazines, derived from the corresponding 4-tetrahydropyranyloxyacetylenic nitriles, undergo base catalysed ring closure to give 3H-furo[3,4-b]-1,4-thiazines.