Modular Synthesis of Pyrrolo[2,1-b]thiazoles and Related Monocyclic Pyrrolo Structures

[摘要]：A modular synthesis of selectively-substituted pyrrolo[2,1-b]thiazoles (Delta(6) isomeric form) has been implemented, involving a distinctive bicyclization reaction of a mucobromic acid derivative followed by a Suzuki-Miyaura coupling. A novel process of Delta(6) to Delta(7) isomerization of the pyrrolothiazole structure was uncovered that appears to involve a 1,4-addition-1,2-elimination mechanism. Preparation of 1,5-dihydropyrrol-2-one structures, selectively substituted at the 3- and 4-positions, was also achieved using the mucobromic acid synthon in a reductive amination process.

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