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The structure of the products obtained when generating quinazolinium-3-methylides in the absence of an activated alkyne has been investigated using X-ray diffraction and NOE experiments in high resolution NMR. All data are in agreement with a pyrrolo[1,2-c]quinazoline structure having aromatic and benzoyl substituents in positions 2 and 3 respectively, and a hydrogen in position 1, in contrast to previous assignments with hydrogen in position 3.

A new synthesis of pyrrolo[1,2-c]quinazoline from quinazolinium N-ylides: a re-investigation