ONE CARBON UNIT TRANSFER TO ENAMINES THROUGH OXAZOLLIDINES AND TETRAHYDRO-2H-1,3-OXAZINE
Oxazolidines and tetrahydro-2H-1,3-oxazine undergo acid catalysed transfer of C2 carbon unit inbetween two nucleophilic carbons of stabilised enamines.
CARBON TRANSFER REACTIONS WITH HETEROCYCLES-V. A FACILE SYNTHESIS OF NIFEDIPINE AND ANALOGUES
Oxazolidines and tetrahydro-(2H)-1,3-oxazines transfer their C(2) units at the carbonyl group oxidation level to alkyl-β-amino/anilinocrotonates to form 1,4-dihydropyridines elaborated at C-4.
Singh, Harjit,Singh, Kamaljit
p. 3967 - 3974
(2007/10/02)
Synthesis and Properties of Ethyl 1,4-Dihydro-5-pyrimidinecarboxylates: Comparison of Dihydropyrimidines and Dihydropyridines
1,4-Dihydropyrimidines which have electron withdrowing groups were sythesized by the desulphurization of pyrimidine-4(1H)-thiones with Raney nickel.Since this compounds are the aza-analogues of dihydropyridines, comparisons of spectral data, pKa' values,