Unusual course of the reaction of N-(tosylmethyl)thiourea and n-(azidomethyl)thiourea with sodium enolate of dimedone

Article abstract of DOI:10.1007/BF02256846

The end product of the reaction of N-(tosylmethyl)thiourea or N-(azidomethyl)thiourea with sodium enolate of dimedone is bis(2-hydroxy-4,4-dimethyl-6-oxocyclohex-1-enyl)methane (methylenebisdimedone) instead of the expected 8a-hydroxy-7,7-dimethyl-2-thiox