Preparation and structure of some cis-fused ureas: cis-perhydrothieno-[3,4-d]imidazol-2-one SS-dioxides
作者:F. Ellis、P. G. Sammes
DOI:10.1039/p19720002866
日期:——
3-dihydro-3-ureidothiophen SS-dioxides (20) with base. Both symmetrically and unsymmetrically substituted cis-fused ureas (2) can be prepared. A similar base-induced reaction of the corresponding 3-carbamoyl-2,3-dihydrothiophen SS-dioxides led, via the corresponding cyclic carbamates (8), by a route involving elimination and double-bond migration, to the corresponding 4-amino-2,3-dihydrothiophen SS-dioxides (11).
已经开发出标题化合物的一般途径。这涉及将2,3-二氢-3-脲基噻吩SS-二氧化物(20)与碱环化。可以制备对称和不对称取代的顺式稠合脲(2)。相应的3-氨基甲酰基-2,3-二氢噻吩SS-二氧化物的类似的碱诱导的反应,通过相应的环状氨基甲酸酯(8),通过涉及消除和双键迁移的途径,导致了相应的4-氨基- 2,3-二氢噻吩SS-二氧化物(11)。