330436-71-0Relevant academic research and scientific papers
Remarkable synthesis of 2-(Z)-6-(E)-4H- [1,4]-thiazepin-5-ones by zwitterionic rhodium-catalyzed chemo- and regioselective cyclohydrocarbonylative ring expansion of acetylenic thiazoles
Van den Hoven,Alper
, p. 1017 - 1022 (2001)
Cyclohydrocarbonylative ring expansion of acetylenic thiazoles in the presence of CO, H2, and catalytic quantities of the zwitterionic rhodium complex η6-C6H5BPh3) -Rh+(1,5-COD) and triphenyl phosphite affords thiazepinones in 61 to 90% yields. This novel transformation of a 5- to a 7-membered heterocycle is readily applied to acetylenic thiazoles containing hydro, alkyl, alkyl halide, vinyl, and benzo substitutents in positions 4 and 5 of the thiazole ring in addition to alkyl-, ether-, ester-, vinyl-, and aryl-substituted alkynes at position 2.
