Synthesis of pyrrolo-castanospermine analogs: A novel fluoride ion induced rearrangement of a 3-trialkylsilyl substituted dihydro-2H-1,2-oxazine to a pyrrole.
摘要:
Hetero Diels-Alder reaction of diene 10, obtained in one step from aldehyde 4, with nitroso dienophile 6 produced the dihydro-2H-1,2-oxazines 12. Treatment of the tosylates 13 derived from 12 with TBAF induced a ring contraction process leading directly to pyrrole 16. Cyclization of this intermediate furnished the pyrrolo-castanospermine derivative 17.
Synthesis of pyrrolo-castanospermine analogs: A novel fluoride ion induced rearrangement of a 3-trialkylsilyl substituted dihydro-2H-1,2-oxazine to a pyrrole.
摘要:
Hetero Diels-Alder reaction of diene 10, obtained in one step from aldehyde 4, with nitroso dienophile 6 produced the dihydro-2H-1,2-oxazines 12. Treatment of the tosylates 13 derived from 12 with TBAF induced a ring contraction process leading directly to pyrrole 16. Cyclization of this intermediate furnished the pyrrolo-castanospermine derivative 17.